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  Weathertightness

There is considerable interest in weathertightness as a result of increasing reports of leaks in relatively new buildings. BRANZ takes this issue seriously and provides the following to assist those interested.

BRANZ already has a wide range of publications on the subject of weathertightness, including a number of articles from past issues of Build and Guideline.

Weathertight Homes Resolution Service (WHRS)

The Weathertight Homes Resolution Services Act 2006 (the WHRS Act) came into force on 1 April 2007 following its enactment on 18 December 2006. The WHRS Act 2006 replaces the WHRS Act 2002. The changes in the WHRS Act are focused on getting leaky homes fixed as early as possible, settling disputes faster and enhancing consumer protection.

WHRS contacts are at www.dbh.govt.nz/weathertight-services or on the Helpline 0800 324 477.

Mould and health

There is a growing awareness of the need to keep homes dry and warm, not only to provide a comfortable environment, but to prevent the growth of mould. Mould spores are carried by air and are found everywhere. When conditions are right they will germinate and start to grow. There are thousands of different types of mould, some of which are harmless, some can be beneficial and some are potential health hazards. When dealing with leaking buildings the potential for finding mould in wall cavities is very high. It is important that the proper precautions are taken to ensure that neither workers nor building occupants are exposed to health hazards from moulds during building repairs.

The New Zealand Department of Labour, Occupational Safety and Health Bulletin No. 17 "Risks to Health From Moulds and Other Fungi" provides more information on moulds and their possible effects on health.

 Weathertightness

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Results
ItemPriceAdd
Air pressure equalisation in rainscreened joints by geometric alteration

Builder's Mate 1 (Sep 2003)

BU610 Preventing moisture problems in timber-framed skillion roofs
$13.50 Add Print version to cart
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BU554 Aluminium joinery installation in direct-fixed cladding
$13.50 Add Print version to cart
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BU553 Aluminium joinery installation in cavity construction
$13.50 Add Print version to cart
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BU550 Damage from weathertightness failure
$13.50 Add Print version to cart
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BU528 Metal tile roofing
$13.50 Add Print version to cart
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BU527 Drained and vented cavities
$13.50 Add Print version to cart
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BU516 Moisture management in masonry veneer
$13.50 Add Print version to cart
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BU509 Sizing gutters and downpipes
$13.50 Add Print version to cart
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BU468 Fixing timber weatherboards
$13.50 Add Print version to cart
 Add PDF to cart

BU431 Care of kiln-dried framing timber
$13.50 Add Print version to cart
 Add PDF to cart

BU411 Recommended timber cladding profiles
$13.50 Add PDF to cart

Drained and vented cavity walls - measured ventilation rates

Effectiveness of weathergrooves in weatherboard cladding

FRST-funded weathertightness research at BRANZ

Guideline May 2011

Guideline July 2010

Guideline January 2010

Pressure equalised rainscreen joint modelling with the numerical model PERAM

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