Specification For Building Works 431xh

Specification for Building Works Nurul Hidayah Bte Yahya Siti Fatiah Bt. Ibrahim Amirul Naim B. Md Zulkifli Afifi Bin Baharom Ahmad Fitri Bin Salehuddin Ahmad Nazri Bin Harun Dahlia Binti Ismail

ArchiNation

1

What is Specification of Buildings? From AIA A201-2007,Specifications merely “that portion of the Contract Documents consisting of the written requirements for the materials, equipment, systems, standards and workmanship for the Work and performance of the related services”.



In Contract without Quantities it is important because to list the exact specification and quantities for the building.



In the Contract with Quantities, it is an addition documents for bill of quantities. The B/Q has already included everything that affects the price. ArchiNation

2

Specifications should generally describe the following : Type and the quality of every product istrations of the contract for construction

Quality of workmanship

Product alternates and options

Requirement of fabrication, erection and application, installation and finishing

Allowances and unit prices in the contract.

Components dimensional ArchiNation

3

s of the specification. 1.







Building Contractor, Estimators and his Site Agent To be read by the Contractor’s Estimator as the only information available to help prepare the competitive tender. Estimators will take their own measurements of the work from the drawings and build up their estimates relying on the specifications for a full description of quality, materials and workmanship. The specification must be specific and crystal clear and complete in detail to protect he client from unwanted claims or uncertainty.

ArchiNation

4

2.

The Architect, his Resident Architect and his Clerk-of-Work



The Architect should use the Drawing and Specifications to ensure compliance with code requirements. Plan checkers need to readily see compliance with applicable codes. The Resident Architect need to supervise the indications activities for quality ensures. The clerk-of-work need to inspect on behalf of the employer, since the constant inspection will be necessary and the architect is not expected to be continuously on the site.



ArchiNation

5

3.



The Quantity Surveyor The Quantity Surveyor need to be able prepares the bill of quantities as a basis for such competitive tenders. The Quantity Surveyor may need to prepare the bill and instructions accordingly given by the architect as complete as those required by the Contractors when taking their own measurements and these instructions are conveyed in a specifications.

ArchiNation

6

SPECIFICATION PRINCIPLE •What can be shown on drawings should be drawn. The rest should be scheduled and specified •The specification should not duplicate the drawings

REQUIREMENTS OF A GOOD SPECIFICATION Specifications should generally describe the type and quantity of every product in the work, quality of workmanship, requirements for fabrication, component dimensional, and specific description of product.

ArchiNation

7

REQUIREMENTS OF A GOOD SPECIFICATION 1. It should be correctly formatted

2. Use proper specification language

3. Should be consistent and complete

4. Use universally accepted

ArchiNation

8

Qualities of the specification

The specification writer should – • Be familiar with all types and classes of works • Understand the building process and trade operations • Be design conscious

ArchiNation

9



Have considerable site supervision experience. Be generally familiar with the construction industry. Be knowledgeable in Contract Law, Building Contraction, materials and fittings, site operation, etc

ArchiNation

10

Parts of a Specification 1.

The Preliminaries Contains a series of preliminary clauses corresponding to the Preliminary Bill in a bill of quantities. The clauses set out all items of general application not covered by the Conditions of Contract. They must not over-ride the Conditions of Contract. ArchiNation

11

Parts of a Specification 2.

The ‘Works Description Section’ Each subject should form a separate paragraph with marginal heading Certain information for each trade can be in the form of Schedules such as for finishes, paintings, windows, doors, ironmongery etc.

ArchiNation

12

For works to be carried out by the specialist sub-contractors, specifying by ‘prime cost sum’ is necessary. For works type and quantity that cannot be determined at the time of tender specifying by ‘provisional sum’ is necessary.

ArchiNation

13

H)Formatting the specification 1) 2)

3)

Using Trade Format: arrange the specs accordingly to sequence of work. Using Elemental Format: works are specified according to elements or rooms rather than trade. marginal headings of clauses are necessary for ease of reference

ArchiNation

14

I)Methods Of Preparing the Specification i. ii. iii.

iv.

To start everything afresh- arduous task & seldom done. To use an old specification as a reference modelusing old specification for similar project as a base To use a standard specification- standard specification containing standard clauses on information and works that most buildings of a particular organization would require is prepared.(exp:JKR) To use library of standard clauses- standard and tersely worded clauses applicable to most types of works are prepared.exp: N.B.S (UK). Malaysia do not have such a specification

ArchiNation

15

Scope Procument using Specification and Drawing in Building Contract without Quantities The Advantages The Disadvantages Consequences of not having a complete and comprehensive Tender Drawing and Building Specification

ArchiNation

16

Procument using Specification and Drawing in Building Contract without Quantities





Under this option the contractor is selected and appointed on the basis of a lump sum bid provided in response to a detailed Specification and Drawing. Appropriate for small projects such as house extensions and renovations because all Tenderers need to produce their own quantities and also the time involved in achieving a sufficiency of the design. Not particularly appropriate where it is likely that change will be required by the Employer after the contract has been started due to the fact that there are no competitive rates under which variation values can be assessed. ArchiNation

17

The Advantages •

•

•

The lump sum price is firm, subject only to variations which may be instructed during the course of the Contract Works. Client risk in respect of errors in a Bill of Quantities is avoided because the Contractor prepares his own measurement and quantities. Can incorporate Design and Build and Performance Specified works if required. ArchiNation

18

The Disadvantages The design must be well advanced in order to prepare the detailed Specification documents. This procurement route can therefore mean a later site start that with alternative procurement routes. • Give less control of cost when variations are instructed than firm Bills of Quantities because the lack of a defined system of measurement of the building elements. • Tenders are not as easily comparable to each other as is possible with Bills of Quantities because the tendering contractors may interpret and price risk in the Specification document in different ways. •

ArchiNation

19

Consequences of not having a complete and comprehensive Tender Drawing and Building Specification

Measurements and quantities are inserted into Tender Contract to enable the tenderers to price the work. If any of the Tender Drawing and Building Specification is not been given, Tenderers have no guidance for determine the budget of the project.

ArchiNation

20

JKR STANDARD SPECIFICATION ArchiNation

21



Standard specifications for building works 2005 booklet is published by Jabatan Kerja Raya (JKR) for the use in conducting the project by the government and non government.



It is an important component in construction phase. Act as a guide for the contractor precisely follow the specification that has been set in Tender Document.



If the contractor fails to comply with the requirement stated, the materials shall be rejected and disciplinary action will be taken.

ArchiNation

22

LINK FOR THE BOOKLET: http://www.jkr.gov.my/page/128

ArchiNation

23

FRONT COVER OF THE BOOKLET ArchiNation

24

COMPONENTS IN STANDARD SPECIFICATIONS A PRELIMINARIES AND GENERAL CONDITIONS B PILING WORK C EXCAVATION AND EARTHWORKS D CONCRETE WORK E BRICKWORK F SOIL DRAINAGE G ROOFING WORK H CARPENTRY , ERY AND IRONMONGERY WORK I STRUCTURAL STEEL AND METAL WORKS J PLASTERING, PAVING AND TILING WORKS K WATER SUPPLY PLUMBING, SANITARY AND RAINWATER GOODS INSTALLATION L GLAZING WORK M PAINTING WORK N EXTERNAL WORK ArchiNation

25

ArchiNation

26

ArchiNation

27

ArchiNation

28