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Project Specification

 

Each building project MUST have a specification document which outlines in detail the code of workmanship of the project. This includes:

  • The quality of materials used
  • The building best practices that must be adhered to, including reference to building standards
  • The site safety requirements and site code of conduct

This document forms part of the building contract.

The following are notes I have gathered to ensure are included in my specification for the rebuild of my leaky house. This includes specific safety measures to be undertaken due to the nature of the project and its inherent risks.

General

Workmanship

The workmanship shall comply with the BIA Building Code (known as E2/AS1) Acceptable Solution Clause E2 External Moisture ( sometimes called the 'Weathertightness Solution') as applies 1 February 2005.

Alternative Solutions as defined by the Code may be considered on its merits and with the written approval of the owner.

Safety

M-95 mask to filter breathed air and approved gloves should be used by all contractors handling any cellulose wall materials covered in stachybotrys.

 

Structure

Materials

All structural timber shall be H3 treated radiata pine and Douglas fir to the provisions of NZS 3602: 2003 (cited in B2/AS1). All timber shall comply with the new treated timber requirements, which were first announced on 23 December 2003. It is the responsibility of the builder to ensure that all materials are confirmed as to treatment specification in accordance with NZS 3602, which requires treatment and identification of timber to be in accordance with a further New Zealand Standard - NZS 3640:2003 Chemical Preservation of Round and Sawn Timber.

Non structural timber may be H1 boron treated radiate pine.

Wind Barriers

All wind barriers must be sealed at all joints with approved tape, suitable to prevent moisture and air entering the interior cavity, and should be suitable to a high wind zone.

 

CLADDING


Cladding materials shall comply with E2/VM1 effective 1 July 2004.

No cladding shall be used outside its specification under any circumstances.

  • FIXING SYSTEM - Overclads vertical aluminium runner (CS-2)
  • CLADDING 1 – James Harvey Titan Panels or PBS Ventclad system using Eterpan with negative jointing. All joints to be positioned in low risk locations
  • CLADDING 2 – Nu-Wall horizontal Louvre [approx 120mm]
  • LOUVRES - 3 Rows of Louvres with down tilt to bottom of kitchen windows sufficient to block out the view of the neighbouring house.

Soffit

A New Block soffit design to be added to provide overhang to windows. This will be clad in the same NuWall profile. This soffit will also provide additional height to the roof profile on the northern face, to provide support additional slope to the roof.

Soffit lining will be in 6mm hardiflex with negative joints lined up to the side cladding

Roof

EXISTING 2 SMALL SKYLIGHT STORMWATER CHANNELLING

Roofing shall overhang Industrial strength storm water channels on northern side of all ceiling skylights for full channelling of water down the eastern side to below the western side of the skylights

Roof Material

Long run Colourcote 5 rib profile


Roof Flashings

Flashings to the Nuwall Boxed Soffit MUST be aluminium.

 

WARRANTIES

Clause B2.2 of the Building Code provides that building materials, components and construction methods must be durable throughout the life of the building. For example, materials fulfilling a structural role must last for at least 50 years. The building envelope, exposed plumbing in the subfloor space, and in-built chimneys and flues must last at least 15 years, and services, interior claddings, renewable protective coatings, and fixtures must last for at least five years.

All products supplied should be approved by accreditation under the Building Act, or meet ISO (International Standardisation Organisation) standards.

All products must be installed to manufacturers’ specifications and by approved applicators.
The Building Act 2004 a warranty that work will be done competently and using suitable building materials is implied in all building contracts.

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