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Bulletins

BRANZ bulletins contain easy-to-read good practice guidelines on a wide range of topics related to building and building performance.

BU671 Reducing construction and demolition waste

This bulletin updates and replaces Bulletin 523 Reducing waste from building sites. It focuses on houses and small buildings.

BU670 Specifying windows and doors under H1

This bulletin guides architects and designers in understanding and specifying windows and doors that comply with the 5th edition of H1/ AS1 and H1/VM1.

BU669 Tools for measuring carbon in new-build houses

This bulletin outlines the BRANZ tools available to architects, designers and engineers to produce houses that have lower carbon footprints.

BU668 Complying with H1 - Housing and buildings up to 300 metres squared

This bulletin gives guidance around proving compliance with H1 using the 5th edition of H1/AS1 and H1/ VM1.

BU667 Earth buildings

Earth buildings typically use locally sourced materials that have low toxicity, are minimally processed and have very low embodied energy. 

BU666 Restoring a home after flood damage

This bulletin is intended to assist with the putting right that is so important after a flood. It covers health and safety considerations, tips for cleaning up inside and outside, drying out the house and repairs. It does not cover making residential properties resilient to flooding.   (This bulletin updates and replaces Bulletin 455).

BU665 Residential greywater systems

Certain types of wastewater from households (greywater from baths, showers and bathroom basins and sometimes from laundry tubs and washing machines) can be reused for subsurface garden irrigation and flushing toilets.

BU664 Residential rainwater systems

Rainwater systems can provide water suitable for drinking and food preparation if it is filtered and/or treated adequately and can also be used for garden irrigation, swimming pools, toilet flushing, baths and showers.

BU663 Universal design for access into homes by vehicle

This bulletin provides a range of universal design considerations for ensuring new and existing homes are accessible by vehicle.

BU662 Universal design for access into homes

This bulletin provides a range of universal design considerations for ensuring the routes to new and existing homes are accessible.

BU661 Residential roofs with high thermal performance

This bulletin describes five highperformance residential roof details that give significantly better thermal performance than traditional construction.

BU660 Residential walls with high thermal performance

This bulletin describes five highperformance residential wall details that give significantly better thermal performance than traditional construction.

BU659 Upgrading the thermal performance of timber windows

This bulletin describes approaches for upgrading thermal performance including reducing air infiltration, replacing ordinary single glazing and retrofitting insulating glass units (IGUs).

(This bulletin updates and replaces Bulletin 507).

BU658 Timber Windows

Timber window installation is outside the scope of Acceptable Solution E2/ AS1, so building consent must be applied for as an alternative method

(This bulletin updates and replaces Bulletin 481).

BU657 Designing water-efficient houses

The primary concern for water supply design in a house will always be the health and safety of the occupants, but beyond that, there are opportunities to reduce consumption of reticulated water through efficient design.

BU656 Designing to avoid houses overheating

This bulletin gives an overview of passive design options for reducing overheating. It does not consider active (mechanical) ventilation systems.

BU655 Building blocks for new-build-net-zero carbon houses

Greenhouse gas emissions from new building work must be reduced for New Zealand to meet its commitment to a net-zero carbon economy. 

This bulletin gives an overview of the decisions that designers, builders and clients can take to reduce the carbon footprints of new houses.

This is the second of two bulletins on net-zero carbon building. It follows Bulletin 651 Climate change, net-zero carbon and the building industry.

BU654 Installation and maintenance of solid fuel appliances

This bulletin outlines considerations for installation, use and maintenance of solid fuel appliances. Solid fuel-burning appliances can be free standing or built in. Terms used for built-in appliances include inbuilt heaters, fireplace heaters, inset or insert fires, slow combustion solid fuel stoves and solid fuel space heaters, which may be installed in an existing fireplace and/or chimney or in a new construction.

Solid fuel appliances, including flue pipes and chimneys, must be regularly cleaned and maintained.

This bulletin replaces Bulletin 306 Inspection procedures for chimneys, fireplaces and solid fuel burning appliances.

BU653 Damp-proof membranes to concrete slabs

Damp-proof membranes (DPMs) or concrete underlays are necessary under on-ground concrete floor slabs to prevent moisture from the ground passing through the slab and damaging the interior finishes, fittings and contents.

The use of a DPM is mandatory under slabs on ground for all habitable spaces and under slabs for garages or ancillary buildings that may be used as habitable spaces in the future.

This bulletin outlines the selection, design and installation requirements for DPMs. It updates and replaces Bulletin 469 of the same name.

BU652 Amendments to Acceptable Solutions and Verification Methods for B1 and E2

Acceptable Solutions and Verification Methods provide a means of demonstrating compliance with the relevant clauses of the New Zealand Building Code (NZBC). It is not mandatory to use Acceptable Solutions and Verification Methods, but if used, building consent authorities (BCAs) and territorial authorities must accept them as providing compliance.

This bulletin highlights some of the key changes to New Zealand Building Code Acceptable Solutions and Verification Methods for clauses B1 Structure and E2 External moisture that have come into effect since 2012. It highlights the amendments introduced in 2019.

This bulletin replaces Bulletin 545 Key changes to B1/AS1 and E2/AS1.