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Standard Method of Measurement for Concrete Repair Second Edition - 1997
www.concreterepair.org.uk Tournai Hall, Evelyn Woods Road, Aldershot, Hants GU11 2LL t: 01252 357835
INDEX INTRODUCTION................................................................................4 Section 1
PRELIMINARIES................................................................................6
Section 2
PREAMBLES .....................................................................................9
Section 3
NOTES ON REPAIR MEASUREMENT ...........................................11 including illustrations
Section 4
METHOD OF MEASUREMENT .......................................................12 General, Trials and Routine Testing ........................................11 Surface Cleaning .....................................................................13 Survey......................................................................................14 Repairs ....................................................................................15 Crack Repairs ..........................................................................17 Pore/Blow Hole Fillers..............................................................18 Levelling Mortars/Fairing Coats ...............................................19 Surface Coatings and Treatments ...........................................19 Resin Injection .........................................................................21
Section 5
SPECIMEN BILL OF QUANTITIES..................................................22 with pages for personal notes
This document was originally prepared by the Technical Committee of the Concrete Repair Association under the Chairmanship of A J Parker, ARICS and first published in 1990. Following extensive use of the document, Notes were issued within a Revision and Addendum leaflet published in October 1994. This 1997 Second Edition of the Standard Method of Measurement for Concrete Repair incorporates the changes and notes of the 1994 leaflet and has been fully updated. A J Parker 1997 Although care has been taken to ensure, to the best of our knowledge, that all data and information contained herein is accurate to the extent that it relates to either matters of fact or accepted practice or matters of opinion at the time of publication the Concrete Repair Association assumes no responsibility for any errors in or misinterpretations of such data and/or information or any loss or damage arising from or related to its use. ©1997 : The Concrete Repair Association ISBN 0 9515430 7 5 Standard Method of Measurement for Concrete Repair (pbk) First Edition May 1990 Second Edition April 1997
2
INTRODUCTION The Concrete Repair Association first produced the “Method of Measurement for Concrete Repair” document in 1990. The document was compiled with the of FeRFA (The Federation for the Repair and Protection of Structures) many of whose are, like those of the Concrete Repair Association, involved in concrete repairs and associated specialist activities. The Concrete Repair Association was also represented on a working party of the Concrete Society to produce a comprehensive model specification document for patch repair to reinforced concrete, being an update of an earlier document, and this included a section on measurement of repairs and was first issued in 1991. The Concrete Repair Association and the Concrete Society took care to ensure that the principles of the methods of measurement were compatible so as to produce a uniform approach within the industry. The Association issued ‘ Notes’ within a ‘Revision and Addendum’ leaflet issued in October 1994. This has been appropriately incorporated into this current fully updated Second Edition of the main document, which also incorporates changes thought appropriate following useful from s of the Method of Measurement. The method of measurement includes for such activities as provision of access, surface cleaning, testing, repair items, surface treatments, etc., and these are treated using principles common in other areas of building, civil and structural engineering. With reference specifically to the Repair items within the method of measurement:a)
b)
c) d)
e)
A single item will include work and materials to complete the repair, e.g. cutting the repair edges square, breaking out the existing concrete, cleaning and protection of reinforcement where exposed, applying the bonding coat and reinstating with mortar. Repairs are measured separately according to the orientation of the surface on which they occur, e.g. soffits of slabs are measured separately from vertical surface of walls; arrises of columns are measured separately from arrises of beams. Flat repairs are measured separately from those which contain an arris. Repairs are generally measured by number in bands of surface area and maximum depth. In the case of arrises they are measured by length or number in bands of girth and maximum depth. Patch repairs, as their name implies, are usually small individual items and the vast majority of repairs should fall into one of the specified area bands and enumerated. However, larger individual repairs are measured by area.
The sub-divisions into different orientations, repair types, areas and depth can lead to a large number of item descriptions. For instance, when fully using the various depth bands and the area bands and taking of possible sub-divisions for vertical and horizontal surfaces and also for repair items to arrises, this can produce in excess of one hundred different items of repair. However, it has been found that the system is simple to operate and it is expected that in practice most projects will be covered by thirty or forty items in total. The specimen Bill of Quantities is in abbreviated form and is for guidance only. There is a space for those using the document to include their own detail notes on 3
the facing pages headed “ Notes”. The preamble item “Bill of Quantities” states that “Bill of Quantities shall fully describe and accurately represent the quantity and quality of works to be carried out”. In concrete repair contracts it is difficult to accurately quantify the amount of work at the time when the contract documents are being prepared. The depth and area of a particular concrete repair item cannot usually be determined until breaking out is complete. The bill of Quantities can therefore be regarded as approximate, the accuracy of the quantities depending upon the degree of initial survey and sampling and testing data available prior to production of the Bill of Quantities document. This should be made clear to all parties involved with the contract. To attempt to overcome some of the difficulties associated with this situation, where remeasurement is inevitable, this method of measurement itemises time related elements such as provision of access and site facilities. These can then be adjusted as necessary if the quantity of work should differ substantially from that shown in the documents, dependent upon the conditions of contract. If there are limitations on the amount of work which can be carried out at one time, resulting from, for example, the extent of scaffolding permitted, it may be necessary to sub-divide the bill to reflect the phasing of the work. To reflect the variation in cost with height above ground related to the time taken for the workforce and materials to get to the place where work is being carried out, particularly in the case of access by cradle, work can be sub-divided into height bands above ground. However, this can lead to a proliferation of different items and subdivision by height above ground needs to be considered on its merits for each case and only used in appropriate circumstances. There are other occasions when sub-division is appropriate, for example, in cases of reduced headroom or confined working space. The method of measurement is ideally suitable for use with computerised systems for surveys, bill of quantities production, schedule of rates pricing and re-measurement and valuation of completed works.
4
SECTION 1: PRELIMINARIES GENERALLY Project, parties and consultants 1.
The name, nature and location of the project shall be stated.
2.
A general description of the works shall be given.
3.
The names and addresses of the Employer and consultants to be named in the contract shall be given.
4.
The names and addresses of any other consultants shall be given.
5.
The address where drawings and other documents may be inspected by appointment shall be given.
Description of Site 1. Information to indicate the boundaries of the site, the means of access and the position of the works shall be given. 2. Attention shall be drawn to any drainage, water, gas and other mains or power services known to exist on or over the site. 3. Attention shall be drawn to any adjacent or abutting buildings. 4. Information to facilitate visiting the site shall be given. Drawings 1.
A list shall be given of the drawings from which the bills of quantities have been prepared and which will be available for inspection by the Contractor. The list shall indicate the location drawings which shall accompany the bills of quantities.
CONTRACT Form, type and conditions of contract 1.
Where the conditions of contract are standard and published for general use, particulars of the edition to be used and a schedule of the clause headings shall be given. Where the standard conditions provide for alternative or optional clauses, the clauses which are to apply shall be stated. Amendments to standard conditions shall be given in full.
2.
Where the conditions of contract are not standard and published for general use the conditions shall be set out in full in the bill of quantities or a schedule of clause headings shall be given where a full set of conditions is supplied with the bill of quantities. In either case where the conditions provide for alternative or optional clauses the clauses which are to apply shall be stated.
3.
Where there is an appendix to the conditions of contract requiring insertions to be made, a schedule of the insertions shall be set out in the bill of quantities.
Contractor's Liability 1.
The following shall be given. a. Contractor's liability for risk or injury to persons and property and of damage to the works.
5
b.
Where the Employer requires the Contractor to effect insurance in respect of the Contractor's liability for any such risk, the relevant particulars shall be given.
c.
Where the Employer intends to relieve the contractor of liability for any such risk, the relevant particulars shall be given.
Employer's Liability Where the cost of insuring any liability of the Employer is required to be included in the contract sum such cost shall be given as a provisional sum. Local Authorities' Fees and Charges Unless the conditions of contract otherwise provide the following shall be given as provisional sums: All fees and charges which the Contractor is required to pay to local authorities. 1. 2.
Rates on all temporary buildings.
Obligations and restrictions imposed by the Employer. 1. Particulars shall be given of any obligations or restrictions to be imposed by the Employer in respect of the following:a.
Access to and possession or use of the site.
b.
Limitations of working space.
c.
Limitations of working hours.
d.
The use or disposal of any materials found on site.
e.
Hoardings, fences, screens, temporary roofs, temporary name boards and advertising rights.
f.
The maintenance of existing live electricity, drainage, water, gas and other mains or power services on or over the site.
g.
The execution or completion of the work in any specific order or in sections or phases.
h.
Maintenance of specific ambient conditions. Alternatively a provisional or prime cost sum shall be given.
j.
Temporary accommodation and facilities for the use of the Employer including heating, lighting, furnishing and attendance.
k.
The installation of telephones for the use of the Employer and the cost of his telephone calls shall be given as a provisional sum.
l.
Any other obligation or restriction.
GENERAL FACILITIES AND OBLIGATIONS 1.
6
For convenience in pricing, items for the following shall be given. Maintaining temporary works, adapting, clearing away and making good shall be deemed to be included with the items. Notices and fees to local authorities and public undertakings related to the following items shall be deemed to be included with the items. a.
Plant, tools and vehicles.
b.
Scaffolding and hoisting.
c.
Site istration and security.
d.
Transport for work people.
e.
Protecting the works from inclement weather.
f.
Water for the works. Particulars shall be given if water will be supplied by the Employer.
g.
Lighting and power for the works. Particulars shall be given if power will be supplied by the Employer.
h.
Temporary roads, hardstandings, crossings and similar items.
j.
Temporary accommodation for the use of the Contractor.
k.
Temporary telephones for the use of the Contractor.
l.
Traffic regulations.
m.
Safety, health and welfare of work people.
n.
Maintenance of public and private roads.
p.
Removing rubbish, protective casings and coverings and clearing the works on completion.
q.
Drying the works.
r.
Temporary fencing, hoardings, screens, guardrails, gantries and similar items.
s.
Control of noise, pollution and all other statutory obligations.
fans,
planked
footways,
CONTINGENCIES Any provision for contingencies shall be given as a provisional sum.
7
SECTION 2: PREAMBLES Introduction This Method of Measurement provides a uniform basis for measuring concrete repair works and embodies the essentials of good practice but more detailed information than is required by this document shall be given where necessary in order to define the precise nature and extent of the required work. Bill of Quantities 1.
Bills of quantities shall fully describe and accurately represent the quantity and quality of the works to be carried out. Work which cannot be measured shall be given as a provisional sum. Work, the extent of which is not known, shall be described as provisional or given in a bill of approximate quantities.
Measurement 1.
Where minimum deductions of voids are dealt with in this document they shall refer only to openings or wants which are within the boundaries of measured areas. Openings or wants which are at the boundaries of measured areas shall always be the subject of deduction irrespective of size.
2.
Where classification is given in this document as being between two limiting dimensions then the interpretation shall be as exceeding the first dimension and not exceeding the second.
3.
Depths of repairs are to be measured as maximum depths.
Item Descriptions 1.
The order of stating dimensions in descriptions shall be consistent and generally in the sequence of length, width and height.
2.
Unless otherwise specifically stated in the bill or herein, the following shall be deemed to be included with all items:a.
Labour and all costs in connection therewith.
b.
Materials, goods and all costs in connection therewith.
c.
Fitting and fixing materials and goods in position.
d.
Plant and all costs in connection therewith.
e.
Waste of materials.
f.
Establishment charges, overhead charges and profit.
Drawn Information 1.
Drawn information where required to be provided for the full implementation of this document is defined as follows: a.
Location drawings. i) ii) iii)
8
Block plan. To identify site and outline of building in relation to Town Plan or other wider context. Site plan. To locate the position of buildings in relation to setting out point, means of access and general layout of site. General locating drawing. To show the position occupied by the various spaces in a building and the general construction and location of principal elements.
b.
Bill diagram. To be drawn information which may be provided with the bills of quantities to aid the description of the item. Information by way of dimensions or detail may be indicated, alternatively such information shall be included in the relevant description that accompanies the bill diagram.
Quantities 1.
Where the unit of billing is the metre, quantities shall be billed to the nearest whole unit. Fractions of a unit less than half shall be disregarded and all other fractions shall be regarded as a whole unit.
2.
Where the application of the above clause would cause an entire item to be eliminated, such item shall be enumerated stating the size.
Provisional or Prime Cost Sums 1.
Where this document requires provisional or prime cost sums to be given in accordance with this clause, the choice of shall be made in accordance with the following definitions. a.
The term "provisional sum" is defined as a sum provided for work or for costs which cannot be entirely foreseen, defined or detailed at the time the tendering documents are issued.
b.
The term "prime cost sum" is defined as a sum provided for work or services to be executed by a nominated sub-contractor, a statutory authority or a public undertaking or for materials or goods to be obtained from a nominated supplier. Such sum shall be deemed to be exclusive of any profit required by the general contractor and provision shall be made for the addition thereof.
Difficult Working Conditions 1.
Alterations and work in existing buildings shall be so described. Handling materials and getting them in or out of such buildings shall be deemed to be included with the items. Labour on existing work shall be so described.
2.
Work carried out in or under water shall be so described stating whether canal, river or sea water and (where applicable) the mean spring levels of high and low water.
Means of Access, Weather Protection & Hoisting 1.
Responsibilities for the provision, erection, maintenance, dismantling and removal of means of access, weather protection and hoisting shall be clearly stated.
9
SECTION 3: NOTES ON REPAIR MEASUREMENT INCLUDING ILLUSTRATIONS General Repair and Repairs to Arrises a) In general, repairs on flat surfaces do not include for the re-creation of an arris and repairs to arrises include for the re-creation of only one arris. (see fig. 1a) b) If a repair to a beam or column includes two arrises it shall be measured as two separate repairs with the centre line of the common face taken as the dividing line between the two repairs. (see fig. 1b) c) Repairs to flat surfaces which include an arris and which lie outside the maximum girth of 450mm shall also be measured as two repairs. The arris repair shall be taken as 450mm girth and the other repair shall be measured as a repair to a flat surface of the remaining area. (see fig. 1c) d) A similar approach shall be adopted if the repair covers two arrises when the repair would be measured as three separate repairs. (see fig. 1d) e) An exception to this is repairs to corners of slabs or balconies and the like. Repairs measured in this category include for the re-creation of three arrises e.g. two horizontal and one vertical meeting as a common point. (see fig. 1e) In this case the area shall be measured as the sum of the areas on the individual faces. f) Repairs including two corners of a slab or balcony and the like involving five arrises shall be measured as two repairs with the centre line of the slab taken as the dividing line between repairs (see fig 1f) g) The depth categories are according to maximum depth of the repair measured perpendicular to the face of the member and taken within a substantial proportion of the repair area. Localised deeper areas which in total do not exceed 10% of the area shall not be taken into when assessing the repair depth. Accidental overbreak shall not be included when assessing the depth of a repair. For repair to corners of slabs of balconies and the like, as in fig. 1e and 1f, where repairs span more than one face of a member, the maximum depth shall be measured on the largest face and this depth used to categorise the repair.
10
FIGURE 1: Illustrations of Repair Measurement
11
SECTION 4: METHOD OF MEASUREMENT GENERAL, TRIALS AND ROUTINE TESTING A general description of the work shall be given. All concrete repair works shall be measured in accordance with this Method of Measurement, incorporating the Notes and Illustrations in Section 3. It is recommended that work to the external elevations of high rise buildings be measured and described in the following height bands above ground level. 0 - 12m above ground level 12 - 20m - ditto 20 - 30m - ditto 30 - 40m - ditto etc. - ditto Site Accommodation Items shall be given for providing, erecting, maintaining, dismantling and removing site accommodation. Means of Access, Weather Protection and Hoisting Items shall be given for providing, erecting, maintaining, dismantling and removing means of access, weather protection and hoisting. Temporary Propping Items shall be given for providing, erecting, maintaining, dismantling and removing temporary propping. Trial Sample s and Repairs Items shall be given for carrying out trial sample s and repairs, including for taking test cubes, pull-off tests and any similar tests required to the samples. Routine Testing Items shall be given for taking test cubes and pull-off tests and any similar tests required, during the course of the works.
12
1.0.0
SURFACE CLEANING
1.1.0
The required method of surface cleaning shall be stated as follows:-
1.1.1
Cleaning by water blasting.
1.1.2
Cleaning by water/steam blasting.
1.1.3
Cleaning by water/grit blasting.
1.1.4
Cleaning by open grit blasting.
1.1.5
Cleaning by vacuum blasting.
1.1.6
Cleaning by use of hand tools e.g. wire brushing, scraping etc.
1.1.7
Cleaning by use of hand held mechanical tool e.g. needle gun, etc.
1.2.0
The nature of the existing surface shall be stated e.g. bare concrete, concrete coated by a protective coating, concrete partially covered by paint etc.
1.3.0
If the cleaning process is required to remove all surface coatings then this must be stated.
1.4.0
The method of measurement shall be as follows:-
1.4.1
Surfaces of concrete walls, columns etc., over 300mm girth
m2
1.4.2
Surfaces not exceeding 150mm girth
m
1.4.3
Surfaces over 150mm but not exceeding 300mm girth
m
1.4.4
Surfaces of concrete ceilings, beams, lintels etc., over 300mm girth
m2
1.4.5
Surfaces not exceeding 150mm girth
m
1.4.6
Surfaces over 150mm but not exceeding 300mm girth
m
1.4.7
Surfaces of the top of concrete slabs over 300mm girth
m2
1.4.8
Surfaces not exceeding 150mm girth.
m
1.4.9
Surfaces over 150mm but not exceeding 300mm girth.
m
1.5.0
Isolated surfaces over 300mm girth stating the number of surfaces
m2
13
2.0.0
SURVEY
2.1.0
The required method/type of survey shall be stated:-
2.1.1
Feature survey.
2.1.2
Cover meter survey.
2.1.3
Sounding survey.
2.2.0
An item shall be included for the preparation of survey documentation. A detailed description shall be included for the type of survey documentation required:-
2.2.1
Marking survey results on drawings provided by Supervising Officer.
2.2.2
Preparation of full plan/elevation drawings of the existing structures.
2.2.3
Preparation of sketches showing plans/elevations of concrete and indicating position of repairs, carbonation tests, cover meter survey depths.
2.2.4
Dimensioned sketches of the above.
2.3.0 2.3.1
The method of measurement shall be as follows:Surfaces of concrete walls, columns etc., over 300mm girth
m2
2.3.2
Surfaces not exceeding 150mm girth
m
2.3.3
Surfaces over 150mm but not exceeding 300mm girth
m
2.3.4
Surfaces of concrete ceilings, beams, lintels etc., over 300mm girth
m2
2.3.5
Surfaces not exceeding 150mm girth
m
2.3.6
Surfaces over 150mm but not exceeding 300mm girth
m
2.3.7
Surfaces of the top of concrete slabs over 300mm girth
m2
2.3.8
Surfaces not exceeding 150mm girth
m
2.3.9
Surfaces over 150mm but not exceeding 300mm girth
m
2.4.0
Isolated surfaces over 300mm girth stating the number of surfaces
m2
2.4.1
Carbonation depth testing
No
2.4.2
Dust sampling for chloride content
No
2.4.3
Drilling to obtain core samples stating diameter and depth
No
2.4.4
Preparation of survey documentation.
Item
2.4.5
Taking photographs
Item
14
3.0.0
REPAIRS
3.1.0
The method of cutting out, preparation of the concrete and steelwork and the repair material shall be stated.
3.2.0
Repairs shall be measured in the following categories:-
3.2.1
Repairs within areas of walls or column faces.
3.2.2
Repairs within areas of ceilings, or soffits of slabs.
3.2.3
Repairs to sides and soffits of beams and lintels.
3.2.4
Repairs to top surfaces of slabs.
3.2.5
Repairs to arrises of walls and columns.
3.2.6
Repairs to top and bottom arrises of beams and lintels.
3.2.7
Repairs to top and bottom arrises of edges of slabs and balconies.
3.2.8
Repairs to corner of slabs and balconies.
3.3.0
Within the above categories 3.2.1, 3.2.2, 3.2.3 and 3.2.4 repairs shall be enumerated stating the surface area in the following stages:-
3.3.1
Surface area not exceeding 0.01m2
3.3.2
Ditto over 0.01 but not exceeding 0.05m2
3.3.3
Ditto over 0.05 but not exceeding 0.10m2
3.3.4
Ditto over 0.10 but not exceeding 0.25m2
3.3.5
Ditto over 0.25 but not exceeding 0.50m2
3.3.6
Ditto over 0.50 but not exceeding 1.00m2
3.3.7
Surface areas over 1.00m2 shall be grouped together and stated in m2
3.4.0
Within the above categories the maximum depth of the repair shall be stated as:-
3.4.1
Not exceeding 25mm deep
3.4.2
Over 25mm but not exceeding 50mm deep
3.4.3
Over 50mm but not exceeding 75mm deep
3.4.4
Over 75mm but not exceeding 100mm deep
3.4.5
Over 100mm but not exceeding 125mm deep
3.4.6
Over 125mm but not exceeding 150mm deep
3.4.7
and thereafter in increments of 50mm
3.5.0
3.5.1
Arris repairs within the above categories 3.2.5, 3.2.6 and 3.2.7 shall be measured by stating the maximum depth in categories 3.4.1 to 3.4.7 and the maximum girth in the following stages:0mm - 150mm girth 15
3.5.2
150mm - 300mm girth
3.5.3
300mm - 450mm girth
3.5.4
Arris repairs shall be measured in linear metres, except repairs not exceeding 300mm long and repairs 300mm - 600mm long, which will be so described and enumerated.
3.5.5
Each arris repair is deemed to include the recreation of one arris only. Should a repair span around three faces of a member, two repairs shall be measured. The mid point between the two arrises shall be taken as the division point between the two repairs.
3.6.0
Corner repairs within the above category 3.2.8 shall be measured by measuring the sum of the repair areas to the faces of the member to be repaired in accordance with clause 3.3.0 and surface area categories 3.3.1 to 3.3.7 and using the maximum depth of the repair in accordance with clause 3.4.0 and depth categories 3.4.1 to 3.4.7, depth measured perpendicular from the face with the largest area. Recreation of arrises is deemed included in this method of measuring.
3.6.1
Each corner repair is deemed to include the recreation of three arrises only. Should a repair span around four faces of a member, two sets of measurements shall be made. The mid point of the member shall be taken as the division point between the two repairs.
3.7.0
Repairs that are to be finished to receive the finished coating system direct must be so described.
3.8.0
Cutting out of steel reinforcing bars shall be measured by number. The size and type of bar, the length of the piece to be cut shall be stated.
3.8.1
Replacement of steel reinforcing bars shall be measured by number stating the size, type and length of new bar and the method of connecting to the existing reinforcement.
3.8.2
Protective coatings to new steel reinforcing bars shall be stated.
16
4.0.0
CRACK REPAIRS
4.1.0
The method of cutting out, preparation of the concrete and the repair material shall be stated.
4.1.1
The final width and depth of the crack repair required, after cutting out, shall be stated in mm.
4.2.0
Crack repair shall be measured within the following categories:-
4.2.1
In surfaces of concrete walls, columns etc.
4.2.2
In surfaces of concrete ceilings, beams, lintels etc.
4.2.3
In surfaces of the top of concrete slabs etc.
4.3.0
The unit of measurement shall be as follows:-
4.3.1
Cracks not exceeding 150mm long
No
4.3.2
Cracks over 150mm but not exceeding 300mm long
No
4.3.3
Cracks over 300mm but not exceeding 1.00m long
No
4.3.4
Cracks exceeding 1.00m length
m
17
5.0.0
PORE/BLOW HOLE FILLERS
5.1.0
The nature of the repair material shall be stated together with a detailed description of the finish required to the existing surface being treated.
5.2.0
The method of measurement shall be as follows:-
5.2.1
Surfaces of walls, columns etc.
5.2.2
Surfaces of ceilings, sides and soffits of beams and lintels etc.
5.2.3
Surfaces of top of slabs etc.
5.3.0
Within these categories the items shall be measured as follows:-
5.3.1
Surfaces over 300mm wide
m2
5.3.2
Isolated surfaces over 300mm wide stating the number of surfaces
m2
5.3.3
Surfaces not exceeding 150m wide
m
5.3.4
Surfaces over 150mm but not exceeding 300mm wide
m
18
6.0.0
LEVELLING MORTARS / FAIRING COATS
6.1.0
The nature of the levelling/fairing material shall be stated together with a detailed description of the surface finish required.
6.1.1
The nature of the surface being levelled shall be stated.
6.1.2
The required finished thickness of the material shall be stated.
6.1.3
Dubbing out coats in preparatory work to extra depths shall be so described stating average thickness.
6.2.0
The method of measurement shall be as follows:-
6.2.1
Surfaces of walls, columns etc.
6.2.2
Surfaces of ceilings, sides and soffits of beams and lintels etc.
6.2.3
Surfaces of top of slabs etc.
6.3.0
Within these categories the items shall be measured as follows:-
6.3.1
Surfaces over 300mm wide
m2
6.3.2
Isolated surfaces over 300mm wide stating the number of surfaces
m2
6.3.3
Surfaces not exceeding 150mm wide
m
6.3.4
Surfaces over 150mm but not exceeding 300mm wide
m
6.4.0
The following labour items shall be measured separately.
6.4.1
External arrises
6.4.2
Finishing up to projecting obstructions not exceeding 500mm girth
6.4.3
Ditto over 500mm girth
m No m
19
7.0.0
SURFACE COATINGS AND TREATMENTS
7.1.0
The nature of the coating material shall be stated.
7.1.1
The nature of the surface being coated shall be stated.
7.1.2
The required number of coats or the required coating thickness shall be stated in Microns.
7.2.0
The method of measurement shall be as follows:-
7.2.1
Surfaces of walls, columns etc., over 300mm girth
m2
7.2.2
Surfaces not exceeding 150mm girth
m
7.2.3
Surfaces over 150mm but not exceeding 300mm girth
m
7.2.4
Surfaces of ceilings, beams, lintels etc., over 300mm girth
m2
7.2.5
Surfaces not exceeding 150mm girth
m
7.2.6
Surfaces over 150mm but not exceeding 300mm girth
m
7.2.7
Surfaces of top of slabs etc., over 300mm girth
m2
7.2.8
Surfaces not exceeding 150mm girth
m
7.2.9
Surfaces over 150mm but not exceeding 300mm girth
m
7.3.0
20
Isolated surface areas not exceeding 1.00m2 shall be given in m2 stating the number of surfaces
m2
8.0.0
RESIN INJECTION
8.1.0
The method of cutting out and preparation of the crack shall be stated.
8.1.1
The type of resin injection, together with mixing proportions and any restrictions on rate of injection shall be stated.
8.2.0
The method of measurement shall be by labour and materials.
8.2.1
Provision shall be made in the Bill of Quantities for the tenderer to price a provisional number of labour and plant hours.
8.2.2
Provision shall be made for a provisional amount of injected materials and shall be measured in Kgs or litres of material used.
21
SECTION 5: SPECIMEN BILL OF QUANTITIES
22
GENERAL Item A
Description
Quantity
Unit
Rate £
Amount £
GENERAL DESCRIPTION OF WORKS TO BE UNDERTAKEN including any special restrictions or limitations to such as working hours to the occupied buildings, phasing of operations, protection, noise limits, access, hoisting and the like
SITE ACCOMMODATION B
Provide and erect site accommodation
Item
C
Maintain site accommodation
Week
D
Dismantle and remove site accommodation
Item
ACCESS, WEATHER PROTECTION AND HOISTING E
Provide and erect access, weather protection and hoisting
Item
F
Maintain access, weather protection and hoisting
Week
G
Dismantle and remove access, weather protection and hoisting
Item
TEMPORARY PROPPING H
Provide and erect temporary propping
Item
J
Maintain temporary propping
Week
K
Dismantle and remove temporary propping
Item Carried to collection
23
NOTES
24
TRIALS AND ROUTINE TESTING Item
Description
Quantity
Unit
Rate £
Amount £
TRIALS A
Trial sample s
No
B
Making and testing sets of three cubes for trial sample s
No
C
Pull-off tests in trial sample s
No
ROUTINE TESTING D
Making and testing sets of three cubes during the course of the works
No
E
Pull-off tests during the course of the works
No
Carried to collection
25
NOTES
26
SURFACE CLEANING Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 WALLS, COLUMNS etc. A
girth exceeding 300mm
m²
B
girth not exceeding 150mm
m
C
girth over 150mm not exceeding 300mm
m
CEILINGS, BEAMS etc. D
girth exceeding 300mm
m²
E
girth not exceeding 150mm
m
F
girth over 150mm not exceeding 300mm
m
TOP OF SLABS etc. G
girth exceeding 300mm
m²
H
girth not exceeding 150mm
m
J
girth over 150mm not exceeding 300mm
m
_______________________________ K
isolated surfaces of walls (In No.
)
m²
L
isolated surfaces of ceilings (In No. )
m²
M
isolated surfaces of tops of slabs (In No.
)
m²
Carried to collection
27
NOTES
28
SURVEY Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 FEATURE SURVEY A
girth exceeding 300mm
m²
B
girth not exceeding 150mm
m
C
girth over 150mm but not exceeding 300mm
m
D
special feature
No
SOUNDING SURVEY E
girth exceeding 300mm
m²
F
girth not exceeding 150mm
m
G
girth over 150mm but not exceeding 300mm
m
COVERMETER SURVEY H
girth exceeding 300mm
m²
J
girth not exceeding 150mm
m
K
girth over 150mm but not exceeding 300mm
m
_______________________________ L
carbonation depth tests
No
M
taking concrete dust samples
No
N
testing concrete dust samples for chloride content
No
P
taking concrete core samples x deep
No
Q
preparation of survey documentation
Item
R
taking photographs
Item
diameter
Carried to collection
29
NOTES
30
REPAIRS TO REINFORCED CONCRETE Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 WALL OR COLUMN FACES Depth not exceeding 25mm A
area not exceeding 0.01m²
No
B
area exceeding 0.01m² but not 0.05m²
No
C
area exceeding 0.05m² but not 0.10m²
No
D
area exceeding 0.10m² but not 0.25m²
No
E
area exceeding 0.25m² but not 0.50m²
No
F
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² G
area A1
m²
H
area B1
m²
Depth exceeding 25mm but not 50mm J
area not exceeding 0.01m²
No
K
area exceeding 0.01m² but not 0.05m²
No
L
area exceeding 0.05m² but not 0.10m²
No
M
area exceeding 0.10m² but not 0.25m²
No
N
area exceeding 0.25m² but not 0.50m²
No
P
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² Q
area A2
m²
R
area B2
m² Carried to collection
31
NOTES
32
REPAIRS TO REINFORCED CONCRETE Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 WITHIN AREAS OF CEILINGS OR SOFFITS OF SLABS Depth not exceeding 25mm A
area not exceeding 0.01m²
No
B
area exceeding 0.01m² but not 0.05m²
No
C
area exceeding 0.05m² but not 0.10m²
No
D
area exceeding 0.10m² but not 0.25m²
No
E
area exceeding 0.25m² but not 0.50m²
No
F
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² G
area A9
m²
H
area B9
m²
etc. Depth exceeding 25mm but not 50mm J
area not exceeding 0.01m²
No
K
area exceeding 0.01m² but not 0.05m²
No
L
area exceeding 0.05m² but not 0.10m²
No
M
area exceeding 0.10m² but not 0.25m²
No
N
area exceeding 0.25m² but not 0.50m²
No
P
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² Q
area A10
m²
R
area B10
m²
etc. Carried to collection
33
NOTES
34
REPAIRS TO REINFORCED CONCRETE Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 SIDES & SOFFITS OF BEAMS & LINTELS Depth not exceeding 25mm A
area not exceeding 0.01m²
No
B
area exceeding 0.01m² but not 0.05m²
No
C
area exceeding 0.05m² but not 0.10m²
No
D
area exceeding 0.10m² but not 0.25m²
No
E
area exceeding 0.25m² but not 0.50m²
No
F
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² G
area A9
m²
H
area B9
m²
etc. Depth exceeding 25mm but not 50mm J
area not exceeding 0.01m²
No
K
area exceeding 0.01m² but not 0.05m²
No
L
area exceeding 0.05m² but not 0.10m²
No
M
area exceeding 0.10m² but not 0.25m²
No
N
area exceeding 0.25m² but not 0.50m²
No
P
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² Q
area A10
m²
R
area B10
m²
etc. Carried to collection
35
NOTES
36
REPAIRS TO REINFORCED CONCRETE Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 TOP SURFACES OF SLABS Depth not exceeding 25mm A
area not exceeding 0.01m²
No
B
area exceeding 0.01m² but not 0.05m²
No
C
area exceeding 0.05m² but not 0.10m²
No
D
area exceeding 0.10m² but not 0.25m²
No
E
area exceeding 0.25m² but not 0.50m²
No
F
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² G
area A9
m²
H
area B9
m²
etc. Depth exceeding 25mm but not 50mm J
area not exceeding 0.01m²
No
K
area exceeding 0.01m² but not 0.05m²
No
L
area exceeding 0.05m² but not 0.10m²
No
M
area exceeding 0.10m² but not 0.25m²
No
N
area exceeding 0.25m² but not 0.50m²
No
P
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² Q
area A10
m²
R
area B10
m²
etc. Carried to collection
37
NOTES
38
REPAIRS TO REINFORCED CONCRETE Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 ARRISES OF WALLS AND COLUMNS Depth not exceeding 25mm Girth not exceeding 150mm A
length not exceeding 300mm
No
B
length exceeding 300mm but not 600mm
No
C
length exceeding 600mm
m
D
length A1
m
E
length B1
m
Depth exceeding 25mm but not 50mm Girth exceeding 150mm but not 300mm F
length not exceeding 300mm
No
G
length exceeding 300mm but not 600mm
No
H
length exceeding 600mm
m
J
length A2
m
K
length B2
m
Carried to collection
39
NOTES
40
REPAIRS TO REINFORCED CONCRETE Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 ARRISES OF BEAMS AND LINTELS Depth not exceeding 25mm Girth not exceeding 150mm A
length not exceeding 300mm
No
B
length exceeding 300mm but not 600mm
No
C
length exceeding 600mm
m
D
length A1
m
E
length B1
m
Depth exceeding 25mm but not 50mm Girth exceeding 150mm but not 300mm F
length not exceeding 300mm
No
G
length exceeding 300mm but not 600mm
No
H
length exceeding 600mm
m
J
length A2
m
K
length B2
m
Carried to collection
41
NOTES
42
REPAIRS TO REINFORCED CONCRETE Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 CORNERS OF SLABS OR BALCONIES Depth not exceeding 25mm A
area not exceeding 0.01m²
No
B
area exceeding 0.01m² but not 0.05m²
No
C
area exceeding 0.05m² but not 0.10m²
No
D
area exceeding 0.10m² but not 0.25m²
No
E
area exceeding 0.25m² but not 0.50m²
No
F
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² G
area A17
m²
H
area B17
m²
Depth exceeding 25mm but not 50mm J
area not exceeding 0.01m²
No
K
area exceeding 0.01m² but not 0.05m²
No
L
area exceeding 0.05m² but not 0.10m²
No
M
area exceeding 0.10m² but not 0.25m²
No
N
area exceeding 0.25m² but not 0.50m²
No
P
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² Q
area A18
m²
R
area B18
m²
etc. Carried to collection
43
NOTES
44
CRACK REPAIRS Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 IN SURFACES OF WALLS, COLUMNS, ETC. After cutting out width not exceeding 5mm, depth not exceeding 10mm A
crack length not exceeding 150mm
No
B
crack length exceeding 150mm but not 300mm
No
C
crack length exceeding 300mm but not 1.00m
No
D
crack length exceeding 1.00m
m
After cutting out, width 10mm, depth 20mm E
crack length not exceeding 150mm
No
F
crack length exceeding 150mm but not 300mm
No
G
crack length exceeding 300mm but not 1.00m
No
H
crack length exceeding 1.00m
m
Carried to collection
45
NOTES
46
PORE/BLOW HOLE FILLERS Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 WALLS, COLUMNS etc. A
width exceeding 300mm
m²
B
width not exceeding 150mm
m
C
width over 150mm not exceeding 300mm
m
CEILINGS, BEAMS etc. D
width exceeding 300mm
m²
E
width not exceeding 150mm
m
F
width over 150mm not exceeding 300mm
m
TOP OF SLABS etc. G
width exceeding 300mm
m²
H
width not exceeding 150mm
m
J
width over 150mm not exceeding 300mm
m
______________________________ K
isolated surfaces of walls (In No.
L
isolated surfaces of ceilings (In No.
M
isolated surfaces of top of slabs (In No.
)
m² )
m² )
m²
Carried to collection
47
NOTES
48
LEVELLING MORTARS / FAIRING COATS Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 Finished Thickness 2mm WALLS, COLUMNS etc. A
width exceeding 300mm
m²
B
width not exceeding 150mm
m
C
width over 150mm not exceeding 300mm
m
CEILINGS, BEAMS etc. D
width exceeding 300mm
m²
E
width not exceeding 150mm
m
F
width over 150mm not exceeding 300mm
m
TOP OF SLABS etc. G
width exceeding 300mm
m²
H
width not exceeding 150mm
m
J
width over 150mm not exceeding 300mm
m
______________________________ K
isolated surfaces of walls (In No.
L
isolated surfaces of ceilings (In No.
M
isolated surfaces of top of slabs (In No.
)
m² )
m² )
m²
_______________________________ N
external arrises
m
P
finishing up to projecting obstructions not exceeding 500m girth
No
Q
ditto over 500mm girth
m Carried to collection
49
NOTES
50
SURFACE COATINGS AND TREATMENTS Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 WALLS, COLUMNS etc. A
girth exceeding 300mm
m²
B
girth not exceeding 150mm
m
C
girth over 150mm not exceeding 300mm
m
CEILINGS, BEAMS D
girth exceeding 300mm
m²
E
girth not exceeding 150mm
m
F
girth over 150mm not exceeding 300mm
m
TOP OF SLABS, etc. G
girth exceeding 300mm
m²
H
girth not exceeding 150mm
m
J
girth over 150mm not exceeding 300mm
m
_______________________________ K
isolated surfaces of walls (In No.
L
isolated surfaces of ceilings (In No.
M
isolated surfaces of top of slabs (In No.
)
m² )
m² )
m²
Carried to collection
51
NOTES
52
www.concreterepair.org.uk Tournai Hall, Evelyn Woods Road, Aldershot, Hants GU11 2LL t: 01252 357835
INDEX INTRODUCTION................................................................................4 Section 1
PRELIMINARIES................................................................................6
Section 2
PREAMBLES .....................................................................................9
Section 3
NOTES ON REPAIR MEASUREMENT ...........................................11 including illustrations
Section 4
METHOD OF MEASUREMENT .......................................................12 General, Trials and Routine Testing ........................................11 Surface Cleaning .....................................................................13 Survey......................................................................................14 Repairs ....................................................................................15 Crack Repairs ..........................................................................17 Pore/Blow Hole Fillers..............................................................18 Levelling Mortars/Fairing Coats ...............................................19 Surface Coatings and Treatments ...........................................19 Resin Injection .........................................................................21
Section 5
SPECIMEN BILL OF QUANTITIES..................................................22 with pages for personal notes
This document was originally prepared by the Technical Committee of the Concrete Repair Association under the Chairmanship of A J Parker, ARICS and first published in 1990. Following extensive use of the document, Notes were issued within a Revision and Addendum leaflet published in October 1994. This 1997 Second Edition of the Standard Method of Measurement for Concrete Repair incorporates the changes and notes of the 1994 leaflet and has been fully updated. A J Parker 1997 Although care has been taken to ensure, to the best of our knowledge, that all data and information contained herein is accurate to the extent that it relates to either matters of fact or accepted practice or matters of opinion at the time of publication the Concrete Repair Association assumes no responsibility for any errors in or misinterpretations of such data and/or information or any loss or damage arising from or related to its use. ©1997 : The Concrete Repair Association ISBN 0 9515430 7 5 Standard Method of Measurement for Concrete Repair (pbk) First Edition May 1990 Second Edition April 1997
2
INTRODUCTION The Concrete Repair Association first produced the “Method of Measurement for Concrete Repair” document in 1990. The document was compiled with the of FeRFA (The Federation for the Repair and Protection of Structures) many of whose are, like those of the Concrete Repair Association, involved in concrete repairs and associated specialist activities. The Concrete Repair Association was also represented on a working party of the Concrete Society to produce a comprehensive model specification document for patch repair to reinforced concrete, being an update of an earlier document, and this included a section on measurement of repairs and was first issued in 1991. The Concrete Repair Association and the Concrete Society took care to ensure that the principles of the methods of measurement were compatible so as to produce a uniform approach within the industry. The Association issued ‘ Notes’ within a ‘Revision and Addendum’ leaflet issued in October 1994. This has been appropriately incorporated into this current fully updated Second Edition of the main document, which also incorporates changes thought appropriate following useful from s of the Method of Measurement. The method of measurement includes for such activities as provision of access, surface cleaning, testing, repair items, surface treatments, etc., and these are treated using principles common in other areas of building, civil and structural engineering. With reference specifically to the Repair items within the method of measurement:a)
b)
c) d)
e)
A single item will include work and materials to complete the repair, e.g. cutting the repair edges square, breaking out the existing concrete, cleaning and protection of reinforcement where exposed, applying the bonding coat and reinstating with mortar. Repairs are measured separately according to the orientation of the surface on which they occur, e.g. soffits of slabs are measured separately from vertical surface of walls; arrises of columns are measured separately from arrises of beams. Flat repairs are measured separately from those which contain an arris. Repairs are generally measured by number in bands of surface area and maximum depth. In the case of arrises they are measured by length or number in bands of girth and maximum depth. Patch repairs, as their name implies, are usually small individual items and the vast majority of repairs should fall into one of the specified area bands and enumerated. However, larger individual repairs are measured by area.
The sub-divisions into different orientations, repair types, areas and depth can lead to a large number of item descriptions. For instance, when fully using the various depth bands and the area bands and taking of possible sub-divisions for vertical and horizontal surfaces and also for repair items to arrises, this can produce in excess of one hundred different items of repair. However, it has been found that the system is simple to operate and it is expected that in practice most projects will be covered by thirty or forty items in total. The specimen Bill of Quantities is in abbreviated form and is for guidance only. There is a space for those using the document to include their own detail notes on 3
the facing pages headed “ Notes”. The preamble item “Bill of Quantities” states that “Bill of Quantities shall fully describe and accurately represent the quantity and quality of works to be carried out”. In concrete repair contracts it is difficult to accurately quantify the amount of work at the time when the contract documents are being prepared. The depth and area of a particular concrete repair item cannot usually be determined until breaking out is complete. The bill of Quantities can therefore be regarded as approximate, the accuracy of the quantities depending upon the degree of initial survey and sampling and testing data available prior to production of the Bill of Quantities document. This should be made clear to all parties involved with the contract. To attempt to overcome some of the difficulties associated with this situation, where remeasurement is inevitable, this method of measurement itemises time related elements such as provision of access and site facilities. These can then be adjusted as necessary if the quantity of work should differ substantially from that shown in the documents, dependent upon the conditions of contract. If there are limitations on the amount of work which can be carried out at one time, resulting from, for example, the extent of scaffolding permitted, it may be necessary to sub-divide the bill to reflect the phasing of the work. To reflect the variation in cost with height above ground related to the time taken for the workforce and materials to get to the place where work is being carried out, particularly in the case of access by cradle, work can be sub-divided into height bands above ground. However, this can lead to a proliferation of different items and subdivision by height above ground needs to be considered on its merits for each case and only used in appropriate circumstances. There are other occasions when sub-division is appropriate, for example, in cases of reduced headroom or confined working space. The method of measurement is ideally suitable for use with computerised systems for surveys, bill of quantities production, schedule of rates pricing and re-measurement and valuation of completed works.
4
SECTION 1: PRELIMINARIES GENERALLY Project, parties and consultants 1.
The name, nature and location of the project shall be stated.
2.
A general description of the works shall be given.
3.
The names and addresses of the Employer and consultants to be named in the contract shall be given.
4.
The names and addresses of any other consultants shall be given.
5.
The address where drawings and other documents may be inspected by appointment shall be given.
Description of Site 1. Information to indicate the boundaries of the site, the means of access and the position of the works shall be given. 2. Attention shall be drawn to any drainage, water, gas and other mains or power services known to exist on or over the site. 3. Attention shall be drawn to any adjacent or abutting buildings. 4. Information to facilitate visiting the site shall be given. Drawings 1.
A list shall be given of the drawings from which the bills of quantities have been prepared and which will be available for inspection by the Contractor. The list shall indicate the location drawings which shall accompany the bills of quantities.
CONTRACT Form, type and conditions of contract 1.
Where the conditions of contract are standard and published for general use, particulars of the edition to be used and a schedule of the clause headings shall be given. Where the standard conditions provide for alternative or optional clauses, the clauses which are to apply shall be stated. Amendments to standard conditions shall be given in full.
2.
Where the conditions of contract are not standard and published for general use the conditions shall be set out in full in the bill of quantities or a schedule of clause headings shall be given where a full set of conditions is supplied with the bill of quantities. In either case where the conditions provide for alternative or optional clauses the clauses which are to apply shall be stated.
3.
Where there is an appendix to the conditions of contract requiring insertions to be made, a schedule of the insertions shall be set out in the bill of quantities.
Contractor's Liability 1.
The following shall be given. a. Contractor's liability for risk or injury to persons and property and of damage to the works.
5
b.
Where the Employer requires the Contractor to effect insurance in respect of the Contractor's liability for any such risk, the relevant particulars shall be given.
c.
Where the Employer intends to relieve the contractor of liability for any such risk, the relevant particulars shall be given.
Employer's Liability Where the cost of insuring any liability of the Employer is required to be included in the contract sum such cost shall be given as a provisional sum. Local Authorities' Fees and Charges Unless the conditions of contract otherwise provide the following shall be given as provisional sums: All fees and charges which the Contractor is required to pay to local authorities. 1. 2.
Rates on all temporary buildings.
Obligations and restrictions imposed by the Employer. 1. Particulars shall be given of any obligations or restrictions to be imposed by the Employer in respect of the following:a.
Access to and possession or use of the site.
b.
Limitations of working space.
c.
Limitations of working hours.
d.
The use or disposal of any materials found on site.
e.
Hoardings, fences, screens, temporary roofs, temporary name boards and advertising rights.
f.
The maintenance of existing live electricity, drainage, water, gas and other mains or power services on or over the site.
g.
The execution or completion of the work in any specific order or in sections or phases.
h.
Maintenance of specific ambient conditions. Alternatively a provisional or prime cost sum shall be given.
j.
Temporary accommodation and facilities for the use of the Employer including heating, lighting, furnishing and attendance.
k.
The installation of telephones for the use of the Employer and the cost of his telephone calls shall be given as a provisional sum.
l.
Any other obligation or restriction.
GENERAL FACILITIES AND OBLIGATIONS 1.
6
For convenience in pricing, items for the following shall be given. Maintaining temporary works, adapting, clearing away and making good shall be deemed to be included with the items. Notices and fees to local authorities and public undertakings related to the following items shall be deemed to be included with the items. a.
Plant, tools and vehicles.
b.
Scaffolding and hoisting.
c.
Site istration and security.
d.
Transport for work people.
e.
Protecting the works from inclement weather.
f.
Water for the works. Particulars shall be given if water will be supplied by the Employer.
g.
Lighting and power for the works. Particulars shall be given if power will be supplied by the Employer.
h.
Temporary roads, hardstandings, crossings and similar items.
j.
Temporary accommodation for the use of the Contractor.
k.
Temporary telephones for the use of the Contractor.
l.
Traffic regulations.
m.
Safety, health and welfare of work people.
n.
Maintenance of public and private roads.
p.
Removing rubbish, protective casings and coverings and clearing the works on completion.
q.
Drying the works.
r.
Temporary fencing, hoardings, screens, guardrails, gantries and similar items.
s.
Control of noise, pollution and all other statutory obligations.
fans,
planked
footways,
CONTINGENCIES Any provision for contingencies shall be given as a provisional sum.
7
SECTION 2: PREAMBLES Introduction This Method of Measurement provides a uniform basis for measuring concrete repair works and embodies the essentials of good practice but more detailed information than is required by this document shall be given where necessary in order to define the precise nature and extent of the required work. Bill of Quantities 1.
Bills of quantities shall fully describe and accurately represent the quantity and quality of the works to be carried out. Work which cannot be measured shall be given as a provisional sum. Work, the extent of which is not known, shall be described as provisional or given in a bill of approximate quantities.
Measurement 1.
Where minimum deductions of voids are dealt with in this document they shall refer only to openings or wants which are within the boundaries of measured areas. Openings or wants which are at the boundaries of measured areas shall always be the subject of deduction irrespective of size.
2.
Where classification is given in this document as being between two limiting dimensions then the interpretation shall be as exceeding the first dimension and not exceeding the second.
3.
Depths of repairs are to be measured as maximum depths.
Item Descriptions 1.
The order of stating dimensions in descriptions shall be consistent and generally in the sequence of length, width and height.
2.
Unless otherwise specifically stated in the bill or herein, the following shall be deemed to be included with all items:a.
Labour and all costs in connection therewith.
b.
Materials, goods and all costs in connection therewith.
c.
Fitting and fixing materials and goods in position.
d.
Plant and all costs in connection therewith.
e.
Waste of materials.
f.
Establishment charges, overhead charges and profit.
Drawn Information 1.
Drawn information where required to be provided for the full implementation of this document is defined as follows: a.
Location drawings. i) ii) iii)
8
Block plan. To identify site and outline of building in relation to Town Plan or other wider context. Site plan. To locate the position of buildings in relation to setting out point, means of access and general layout of site. General locating drawing. To show the position occupied by the various spaces in a building and the general construction and location of principal elements.
b.
Bill diagram. To be drawn information which may be provided with the bills of quantities to aid the description of the item. Information by way of dimensions or detail may be indicated, alternatively such information shall be included in the relevant description that accompanies the bill diagram.
Quantities 1.
Where the unit of billing is the metre, quantities shall be billed to the nearest whole unit. Fractions of a unit less than half shall be disregarded and all other fractions shall be regarded as a whole unit.
2.
Where the application of the above clause would cause an entire item to be eliminated, such item shall be enumerated stating the size.
Provisional or Prime Cost Sums 1.
Where this document requires provisional or prime cost sums to be given in accordance with this clause, the choice of shall be made in accordance with the following definitions. a.
The term "provisional sum" is defined as a sum provided for work or for costs which cannot be entirely foreseen, defined or detailed at the time the tendering documents are issued.
b.
The term "prime cost sum" is defined as a sum provided for work or services to be executed by a nominated sub-contractor, a statutory authority or a public undertaking or for materials or goods to be obtained from a nominated supplier. Such sum shall be deemed to be exclusive of any profit required by the general contractor and provision shall be made for the addition thereof.
Difficult Working Conditions 1.
Alterations and work in existing buildings shall be so described. Handling materials and getting them in or out of such buildings shall be deemed to be included with the items. Labour on existing work shall be so described.
2.
Work carried out in or under water shall be so described stating whether canal, river or sea water and (where applicable) the mean spring levels of high and low water.
Means of Access, Weather Protection & Hoisting 1.
Responsibilities for the provision, erection, maintenance, dismantling and removal of means of access, weather protection and hoisting shall be clearly stated.
9
SECTION 3: NOTES ON REPAIR MEASUREMENT INCLUDING ILLUSTRATIONS General Repair and Repairs to Arrises a) In general, repairs on flat surfaces do not include for the re-creation of an arris and repairs to arrises include for the re-creation of only one arris. (see fig. 1a) b) If a repair to a beam or column includes two arrises it shall be measured as two separate repairs with the centre line of the common face taken as the dividing line between the two repairs. (see fig. 1b) c) Repairs to flat surfaces which include an arris and which lie outside the maximum girth of 450mm shall also be measured as two repairs. The arris repair shall be taken as 450mm girth and the other repair shall be measured as a repair to a flat surface of the remaining area. (see fig. 1c) d) A similar approach shall be adopted if the repair covers two arrises when the repair would be measured as three separate repairs. (see fig. 1d) e) An exception to this is repairs to corners of slabs or balconies and the like. Repairs measured in this category include for the re-creation of three arrises e.g. two horizontal and one vertical meeting as a common point. (see fig. 1e) In this case the area shall be measured as the sum of the areas on the individual faces. f) Repairs including two corners of a slab or balcony and the like involving five arrises shall be measured as two repairs with the centre line of the slab taken as the dividing line between repairs (see fig 1f) g) The depth categories are according to maximum depth of the repair measured perpendicular to the face of the member and taken within a substantial proportion of the repair area. Localised deeper areas which in total do not exceed 10% of the area shall not be taken into when assessing the repair depth. Accidental overbreak shall not be included when assessing the depth of a repair. For repair to corners of slabs of balconies and the like, as in fig. 1e and 1f, where repairs span more than one face of a member, the maximum depth shall be measured on the largest face and this depth used to categorise the repair.
10
FIGURE 1: Illustrations of Repair Measurement
11
SECTION 4: METHOD OF MEASUREMENT GENERAL, TRIALS AND ROUTINE TESTING A general description of the work shall be given. All concrete repair works shall be measured in accordance with this Method of Measurement, incorporating the Notes and Illustrations in Section 3. It is recommended that work to the external elevations of high rise buildings be measured and described in the following height bands above ground level. 0 - 12m above ground level 12 - 20m - ditto 20 - 30m - ditto 30 - 40m - ditto etc. - ditto Site Accommodation Items shall be given for providing, erecting, maintaining, dismantling and removing site accommodation. Means of Access, Weather Protection and Hoisting Items shall be given for providing, erecting, maintaining, dismantling and removing means of access, weather protection and hoisting. Temporary Propping Items shall be given for providing, erecting, maintaining, dismantling and removing temporary propping. Trial Sample s and Repairs Items shall be given for carrying out trial sample s and repairs, including for taking test cubes, pull-off tests and any similar tests required to the samples. Routine Testing Items shall be given for taking test cubes and pull-off tests and any similar tests required, during the course of the works.
12
1.0.0
SURFACE CLEANING
1.1.0
The required method of surface cleaning shall be stated as follows:-
1.1.1
Cleaning by water blasting.
1.1.2
Cleaning by water/steam blasting.
1.1.3
Cleaning by water/grit blasting.
1.1.4
Cleaning by open grit blasting.
1.1.5
Cleaning by vacuum blasting.
1.1.6
Cleaning by use of hand tools e.g. wire brushing, scraping etc.
1.1.7
Cleaning by use of hand held mechanical tool e.g. needle gun, etc.
1.2.0
The nature of the existing surface shall be stated e.g. bare concrete, concrete coated by a protective coating, concrete partially covered by paint etc.
1.3.0
If the cleaning process is required to remove all surface coatings then this must be stated.
1.4.0
The method of measurement shall be as follows:-
1.4.1
Surfaces of concrete walls, columns etc., over 300mm girth
m2
1.4.2
Surfaces not exceeding 150mm girth
m
1.4.3
Surfaces over 150mm but not exceeding 300mm girth
m
1.4.4
Surfaces of concrete ceilings, beams, lintels etc., over 300mm girth
m2
1.4.5
Surfaces not exceeding 150mm girth
m
1.4.6
Surfaces over 150mm but not exceeding 300mm girth
m
1.4.7
Surfaces of the top of concrete slabs over 300mm girth
m2
1.4.8
Surfaces not exceeding 150mm girth.
m
1.4.9
Surfaces over 150mm but not exceeding 300mm girth.
m
1.5.0
Isolated surfaces over 300mm girth stating the number of surfaces
m2
13
2.0.0
SURVEY
2.1.0
The required method/type of survey shall be stated:-
2.1.1
Feature survey.
2.1.2
Cover meter survey.
2.1.3
Sounding survey.
2.2.0
An item shall be included for the preparation of survey documentation. A detailed description shall be included for the type of survey documentation required:-
2.2.1
Marking survey results on drawings provided by Supervising Officer.
2.2.2
Preparation of full plan/elevation drawings of the existing structures.
2.2.3
Preparation of sketches showing plans/elevations of concrete and indicating position of repairs, carbonation tests, cover meter survey depths.
2.2.4
Dimensioned sketches of the above.
2.3.0 2.3.1
The method of measurement shall be as follows:Surfaces of concrete walls, columns etc., over 300mm girth
m2
2.3.2
Surfaces not exceeding 150mm girth
m
2.3.3
Surfaces over 150mm but not exceeding 300mm girth
m
2.3.4
Surfaces of concrete ceilings, beams, lintels etc., over 300mm girth
m2
2.3.5
Surfaces not exceeding 150mm girth
m
2.3.6
Surfaces over 150mm but not exceeding 300mm girth
m
2.3.7
Surfaces of the top of concrete slabs over 300mm girth
m2
2.3.8
Surfaces not exceeding 150mm girth
m
2.3.9
Surfaces over 150mm but not exceeding 300mm girth
m
2.4.0
Isolated surfaces over 300mm girth stating the number of surfaces
m2
2.4.1
Carbonation depth testing
No
2.4.2
Dust sampling for chloride content
No
2.4.3
Drilling to obtain core samples stating diameter and depth
No
2.4.4
Preparation of survey documentation.
Item
2.4.5
Taking photographs
Item
14
3.0.0
REPAIRS
3.1.0
The method of cutting out, preparation of the concrete and steelwork and the repair material shall be stated.
3.2.0
Repairs shall be measured in the following categories:-
3.2.1
Repairs within areas of walls or column faces.
3.2.2
Repairs within areas of ceilings, or soffits of slabs.
3.2.3
Repairs to sides and soffits of beams and lintels.
3.2.4
Repairs to top surfaces of slabs.
3.2.5
Repairs to arrises of walls and columns.
3.2.6
Repairs to top and bottom arrises of beams and lintels.
3.2.7
Repairs to top and bottom arrises of edges of slabs and balconies.
3.2.8
Repairs to corner of slabs and balconies.
3.3.0
Within the above categories 3.2.1, 3.2.2, 3.2.3 and 3.2.4 repairs shall be enumerated stating the surface area in the following stages:-
3.3.1
Surface area not exceeding 0.01m2
3.3.2
Ditto over 0.01 but not exceeding 0.05m2
3.3.3
Ditto over 0.05 but not exceeding 0.10m2
3.3.4
Ditto over 0.10 but not exceeding 0.25m2
3.3.5
Ditto over 0.25 but not exceeding 0.50m2
3.3.6
Ditto over 0.50 but not exceeding 1.00m2
3.3.7
Surface areas over 1.00m2 shall be grouped together and stated in m2
3.4.0
Within the above categories the maximum depth of the repair shall be stated as:-
3.4.1
Not exceeding 25mm deep
3.4.2
Over 25mm but not exceeding 50mm deep
3.4.3
Over 50mm but not exceeding 75mm deep
3.4.4
Over 75mm but not exceeding 100mm deep
3.4.5
Over 100mm but not exceeding 125mm deep
3.4.6
Over 125mm but not exceeding 150mm deep
3.4.7
and thereafter in increments of 50mm
3.5.0
3.5.1
Arris repairs within the above categories 3.2.5, 3.2.6 and 3.2.7 shall be measured by stating the maximum depth in categories 3.4.1 to 3.4.7 and the maximum girth in the following stages:0mm - 150mm girth 15
3.5.2
150mm - 300mm girth
3.5.3
300mm - 450mm girth
3.5.4
Arris repairs shall be measured in linear metres, except repairs not exceeding 300mm long and repairs 300mm - 600mm long, which will be so described and enumerated.
3.5.5
Each arris repair is deemed to include the recreation of one arris only. Should a repair span around three faces of a member, two repairs shall be measured. The mid point between the two arrises shall be taken as the division point between the two repairs.
3.6.0
Corner repairs within the above category 3.2.8 shall be measured by measuring the sum of the repair areas to the faces of the member to be repaired in accordance with clause 3.3.0 and surface area categories 3.3.1 to 3.3.7 and using the maximum depth of the repair in accordance with clause 3.4.0 and depth categories 3.4.1 to 3.4.7, depth measured perpendicular from the face with the largest area. Recreation of arrises is deemed included in this method of measuring.
3.6.1
Each corner repair is deemed to include the recreation of three arrises only. Should a repair span around four faces of a member, two sets of measurements shall be made. The mid point of the member shall be taken as the division point between the two repairs.
3.7.0
Repairs that are to be finished to receive the finished coating system direct must be so described.
3.8.0
Cutting out of steel reinforcing bars shall be measured by number. The size and type of bar, the length of the piece to be cut shall be stated.
3.8.1
Replacement of steel reinforcing bars shall be measured by number stating the size, type and length of new bar and the method of connecting to the existing reinforcement.
3.8.2
Protective coatings to new steel reinforcing bars shall be stated.
16
4.0.0
CRACK REPAIRS
4.1.0
The method of cutting out, preparation of the concrete and the repair material shall be stated.
4.1.1
The final width and depth of the crack repair required, after cutting out, shall be stated in mm.
4.2.0
Crack repair shall be measured within the following categories:-
4.2.1
In surfaces of concrete walls, columns etc.
4.2.2
In surfaces of concrete ceilings, beams, lintels etc.
4.2.3
In surfaces of the top of concrete slabs etc.
4.3.0
The unit of measurement shall be as follows:-
4.3.1
Cracks not exceeding 150mm long
No
4.3.2
Cracks over 150mm but not exceeding 300mm long
No
4.3.3
Cracks over 300mm but not exceeding 1.00m long
No
4.3.4
Cracks exceeding 1.00m length
m
17
5.0.0
PORE/BLOW HOLE FILLERS
5.1.0
The nature of the repair material shall be stated together with a detailed description of the finish required to the existing surface being treated.
5.2.0
The method of measurement shall be as follows:-
5.2.1
Surfaces of walls, columns etc.
5.2.2
Surfaces of ceilings, sides and soffits of beams and lintels etc.
5.2.3
Surfaces of top of slabs etc.
5.3.0
Within these categories the items shall be measured as follows:-
5.3.1
Surfaces over 300mm wide
m2
5.3.2
Isolated surfaces over 300mm wide stating the number of surfaces
m2
5.3.3
Surfaces not exceeding 150m wide
m
5.3.4
Surfaces over 150mm but not exceeding 300mm wide
m
18
6.0.0
LEVELLING MORTARS / FAIRING COATS
6.1.0
The nature of the levelling/fairing material shall be stated together with a detailed description of the surface finish required.
6.1.1
The nature of the surface being levelled shall be stated.
6.1.2
The required finished thickness of the material shall be stated.
6.1.3
Dubbing out coats in preparatory work to extra depths shall be so described stating average thickness.
6.2.0
The method of measurement shall be as follows:-
6.2.1
Surfaces of walls, columns etc.
6.2.2
Surfaces of ceilings, sides and soffits of beams and lintels etc.
6.2.3
Surfaces of top of slabs etc.
6.3.0
Within these categories the items shall be measured as follows:-
6.3.1
Surfaces over 300mm wide
m2
6.3.2
Isolated surfaces over 300mm wide stating the number of surfaces
m2
6.3.3
Surfaces not exceeding 150mm wide
m
6.3.4
Surfaces over 150mm but not exceeding 300mm wide
m
6.4.0
The following labour items shall be measured separately.
6.4.1
External arrises
6.4.2
Finishing up to projecting obstructions not exceeding 500mm girth
6.4.3
Ditto over 500mm girth
m No m
19
7.0.0
SURFACE COATINGS AND TREATMENTS
7.1.0
The nature of the coating material shall be stated.
7.1.1
The nature of the surface being coated shall be stated.
7.1.2
The required number of coats or the required coating thickness shall be stated in Microns.
7.2.0
The method of measurement shall be as follows:-
7.2.1
Surfaces of walls, columns etc., over 300mm girth
m2
7.2.2
Surfaces not exceeding 150mm girth
m
7.2.3
Surfaces over 150mm but not exceeding 300mm girth
m
7.2.4
Surfaces of ceilings, beams, lintels etc., over 300mm girth
m2
7.2.5
Surfaces not exceeding 150mm girth
m
7.2.6
Surfaces over 150mm but not exceeding 300mm girth
m
7.2.7
Surfaces of top of slabs etc., over 300mm girth
m2
7.2.8
Surfaces not exceeding 150mm girth
m
7.2.9
Surfaces over 150mm but not exceeding 300mm girth
m
7.3.0
20
Isolated surface areas not exceeding 1.00m2 shall be given in m2 stating the number of surfaces
m2
8.0.0
RESIN INJECTION
8.1.0
The method of cutting out and preparation of the crack shall be stated.
8.1.1
The type of resin injection, together with mixing proportions and any restrictions on rate of injection shall be stated.
8.2.0
The method of measurement shall be by labour and materials.
8.2.1
Provision shall be made in the Bill of Quantities for the tenderer to price a provisional number of labour and plant hours.
8.2.2
Provision shall be made for a provisional amount of injected materials and shall be measured in Kgs or litres of material used.
21
SECTION 5: SPECIMEN BILL OF QUANTITIES
22
GENERAL Item A
Description
Quantity
Unit
Rate £
Amount £
GENERAL DESCRIPTION OF WORKS TO BE UNDERTAKEN including any special restrictions or limitations to such as working hours to the occupied buildings, phasing of operations, protection, noise limits, access, hoisting and the like
SITE ACCOMMODATION B
Provide and erect site accommodation
Item
C
Maintain site accommodation
Week
D
Dismantle and remove site accommodation
Item
ACCESS, WEATHER PROTECTION AND HOISTING E
Provide and erect access, weather protection and hoisting
Item
F
Maintain access, weather protection and hoisting
Week
G
Dismantle and remove access, weather protection and hoisting
Item
TEMPORARY PROPPING H
Provide and erect temporary propping
Item
J
Maintain temporary propping
Week
K
Dismantle and remove temporary propping
Item Carried to collection
23
NOTES
24
TRIALS AND ROUTINE TESTING Item
Description
Quantity
Unit
Rate £
Amount £
TRIALS A
Trial sample s
No
B
Making and testing sets of three cubes for trial sample s
No
C
Pull-off tests in trial sample s
No
ROUTINE TESTING D
Making and testing sets of three cubes during the course of the works
No
E
Pull-off tests during the course of the works
No
Carried to collection
25
NOTES
26
SURFACE CLEANING Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 WALLS, COLUMNS etc. A
girth exceeding 300mm
m²
B
girth not exceeding 150mm
m
C
girth over 150mm not exceeding 300mm
m
CEILINGS, BEAMS etc. D
girth exceeding 300mm
m²
E
girth not exceeding 150mm
m
F
girth over 150mm not exceeding 300mm
m
TOP OF SLABS etc. G
girth exceeding 300mm
m²
H
girth not exceeding 150mm
m
J
girth over 150mm not exceeding 300mm
m
_______________________________ K
isolated surfaces of walls (In No.
)
m²
L
isolated surfaces of ceilings (In No. )
m²
M
isolated surfaces of tops of slabs (In No.
)
m²
Carried to collection
27
NOTES
28
SURVEY Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 FEATURE SURVEY A
girth exceeding 300mm
m²
B
girth not exceeding 150mm
m
C
girth over 150mm but not exceeding 300mm
m
D
special feature
No
SOUNDING SURVEY E
girth exceeding 300mm
m²
F
girth not exceeding 150mm
m
G
girth over 150mm but not exceeding 300mm
m
COVERMETER SURVEY H
girth exceeding 300mm
m²
J
girth not exceeding 150mm
m
K
girth over 150mm but not exceeding 300mm
m
_______________________________ L
carbonation depth tests
No
M
taking concrete dust samples
No
N
testing concrete dust samples for chloride content
No
P
taking concrete core samples x deep
No
Q
preparation of survey documentation
Item
R
taking photographs
Item
diameter
Carried to collection
29
NOTES
30
REPAIRS TO REINFORCED CONCRETE Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 WALL OR COLUMN FACES Depth not exceeding 25mm A
area not exceeding 0.01m²
No
B
area exceeding 0.01m² but not 0.05m²
No
C
area exceeding 0.05m² but not 0.10m²
No
D
area exceeding 0.10m² but not 0.25m²
No
E
area exceeding 0.25m² but not 0.50m²
No
F
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² G
area A1
m²
H
area B1
m²
Depth exceeding 25mm but not 50mm J
area not exceeding 0.01m²
No
K
area exceeding 0.01m² but not 0.05m²
No
L
area exceeding 0.05m² but not 0.10m²
No
M
area exceeding 0.10m² but not 0.25m²
No
N
area exceeding 0.25m² but not 0.50m²
No
P
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² Q
area A2
m²
R
area B2
m² Carried to collection
31
NOTES
32
REPAIRS TO REINFORCED CONCRETE Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 WITHIN AREAS OF CEILINGS OR SOFFITS OF SLABS Depth not exceeding 25mm A
area not exceeding 0.01m²
No
B
area exceeding 0.01m² but not 0.05m²
No
C
area exceeding 0.05m² but not 0.10m²
No
D
area exceeding 0.10m² but not 0.25m²
No
E
area exceeding 0.25m² but not 0.50m²
No
F
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² G
area A9
m²
H
area B9
m²
etc. Depth exceeding 25mm but not 50mm J
area not exceeding 0.01m²
No
K
area exceeding 0.01m² but not 0.05m²
No
L
area exceeding 0.05m² but not 0.10m²
No
M
area exceeding 0.10m² but not 0.25m²
No
N
area exceeding 0.25m² but not 0.50m²
No
P
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² Q
area A10
m²
R
area B10
m²
etc. Carried to collection
33
NOTES
34
REPAIRS TO REINFORCED CONCRETE Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 SIDES & SOFFITS OF BEAMS & LINTELS Depth not exceeding 25mm A
area not exceeding 0.01m²
No
B
area exceeding 0.01m² but not 0.05m²
No
C
area exceeding 0.05m² but not 0.10m²
No
D
area exceeding 0.10m² but not 0.25m²
No
E
area exceeding 0.25m² but not 0.50m²
No
F
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² G
area A9
m²
H
area B9
m²
etc. Depth exceeding 25mm but not 50mm J
area not exceeding 0.01m²
No
K
area exceeding 0.01m² but not 0.05m²
No
L
area exceeding 0.05m² but not 0.10m²
No
M
area exceeding 0.10m² but not 0.25m²
No
N
area exceeding 0.25m² but not 0.50m²
No
P
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² Q
area A10
m²
R
area B10
m²
etc. Carried to collection
35
NOTES
36
REPAIRS TO REINFORCED CONCRETE Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 TOP SURFACES OF SLABS Depth not exceeding 25mm A
area not exceeding 0.01m²
No
B
area exceeding 0.01m² but not 0.05m²
No
C
area exceeding 0.05m² but not 0.10m²
No
D
area exceeding 0.10m² but not 0.25m²
No
E
area exceeding 0.25m² but not 0.50m²
No
F
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² G
area A9
m²
H
area B9
m²
etc. Depth exceeding 25mm but not 50mm J
area not exceeding 0.01m²
No
K
area exceeding 0.01m² but not 0.05m²
No
L
area exceeding 0.05m² but not 0.10m²
No
M
area exceeding 0.10m² but not 0.25m²
No
N
area exceeding 0.25m² but not 0.50m²
No
P
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² Q
area A10
m²
R
area B10
m²
etc. Carried to collection
37
NOTES
38
REPAIRS TO REINFORCED CONCRETE Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 ARRISES OF WALLS AND COLUMNS Depth not exceeding 25mm Girth not exceeding 150mm A
length not exceeding 300mm
No
B
length exceeding 300mm but not 600mm
No
C
length exceeding 600mm
m
D
length A1
m
E
length B1
m
Depth exceeding 25mm but not 50mm Girth exceeding 150mm but not 300mm F
length not exceeding 300mm
No
G
length exceeding 300mm but not 600mm
No
H
length exceeding 600mm
m
J
length A2
m
K
length B2
m
Carried to collection
39
NOTES
40
REPAIRS TO REINFORCED CONCRETE Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 ARRISES OF BEAMS AND LINTELS Depth not exceeding 25mm Girth not exceeding 150mm A
length not exceeding 300mm
No
B
length exceeding 300mm but not 600mm
No
C
length exceeding 600mm
m
D
length A1
m
E
length B1
m
Depth exceeding 25mm but not 50mm Girth exceeding 150mm but not 300mm F
length not exceeding 300mm
No
G
length exceeding 300mm but not 600mm
No
H
length exceeding 600mm
m
J
length A2
m
K
length B2
m
Carried to collection
41
NOTES
42
REPAIRS TO REINFORCED CONCRETE Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 CORNERS OF SLABS OR BALCONIES Depth not exceeding 25mm A
area not exceeding 0.01m²
No
B
area exceeding 0.01m² but not 0.05m²
No
C
area exceeding 0.05m² but not 0.10m²
No
D
area exceeding 0.10m² but not 0.25m²
No
E
area exceeding 0.25m² but not 0.50m²
No
F
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² G
area A17
m²
H
area B17
m²
Depth exceeding 25mm but not 50mm J
area not exceeding 0.01m²
No
K
area exceeding 0.01m² but not 0.05m²
No
L
area exceeding 0.05m² but not 0.10m²
No
M
area exceeding 0.10m² but not 0.25m²
No
N
area exceeding 0.25m² but not 0.50m²
No
P
area exceeding 0.50m² but not 1.00m²
No
Areas exceeding 1.00m² Q
area A18
m²
R
area B18
m²
etc. Carried to collection
43
NOTES
44
CRACK REPAIRS Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 IN SURFACES OF WALLS, COLUMNS, ETC. After cutting out width not exceeding 5mm, depth not exceeding 10mm A
crack length not exceeding 150mm
No
B
crack length exceeding 150mm but not 300mm
No
C
crack length exceeding 300mm but not 1.00m
No
D
crack length exceeding 1.00m
m
After cutting out, width 10mm, depth 20mm E
crack length not exceeding 150mm
No
F
crack length exceeding 150mm but not 300mm
No
G
crack length exceeding 300mm but not 1.00m
No
H
crack length exceeding 1.00m
m
Carried to collection
45
NOTES
46
PORE/BLOW HOLE FILLERS Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 WALLS, COLUMNS etc. A
width exceeding 300mm
m²
B
width not exceeding 150mm
m
C
width over 150mm not exceeding 300mm
m
CEILINGS, BEAMS etc. D
width exceeding 300mm
m²
E
width not exceeding 150mm
m
F
width over 150mm not exceeding 300mm
m
TOP OF SLABS etc. G
width exceeding 300mm
m²
H
width not exceeding 150mm
m
J
width over 150mm not exceeding 300mm
m
______________________________ K
isolated surfaces of walls (In No.
L
isolated surfaces of ceilings (In No.
M
isolated surfaces of top of slabs (In No.
)
m² )
m² )
m²
Carried to collection
47
NOTES
48
LEVELLING MORTARS / FAIRING COATS Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 Finished Thickness 2mm WALLS, COLUMNS etc. A
width exceeding 300mm
m²
B
width not exceeding 150mm
m
C
width over 150mm not exceeding 300mm
m
CEILINGS, BEAMS etc. D
width exceeding 300mm
m²
E
width not exceeding 150mm
m
F
width over 150mm not exceeding 300mm
m
TOP OF SLABS etc. G
width exceeding 300mm
m²
H
width not exceeding 150mm
m
J
width over 150mm not exceeding 300mm
m
______________________________ K
isolated surfaces of walls (In No.
L
isolated surfaces of ceilings (In No.
M
isolated surfaces of top of slabs (In No.
)
m² )
m² )
m²
_______________________________ N
external arrises
m
P
finishing up to projecting obstructions not exceeding 500m girth
No
Q
ditto over 500mm girth
m Carried to collection
49
NOTES
50
SURFACE COATINGS AND TREATMENTS Item
Description
Quantity
Unit
Rate £
Amount £
LOCATION Z1 WALLS, COLUMNS etc. A
girth exceeding 300mm
m²
B
girth not exceeding 150mm
m
C
girth over 150mm not exceeding 300mm
m
CEILINGS, BEAMS D
girth exceeding 300mm
m²
E
girth not exceeding 150mm
m
F
girth over 150mm not exceeding 300mm
m
TOP OF SLABS, etc. G
girth exceeding 300mm
m²
H
girth not exceeding 150mm
m
J
girth over 150mm not exceeding 300mm
m
_______________________________ K
isolated surfaces of walls (In No.
L
isolated surfaces of ceilings (In No.
M
isolated surfaces of top of slabs (In No.
)
m² )
m² )
m²
Carried to collection
51
NOTES
52
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