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Roofs, walls, windows and doors must be weathertight to prevent leaks and damage caused by moisture. BRANZ can evaluate weathertightness through laboratory-based and on-site tests of air permeability, watertightness and wind resistance.

<p data-block-key="uwf1c">These graphs investigate how 1 or 2 storeys affects results.</p>

<p data-block-key="uv06r">These graphs investigate the effects of glazing distribution and orientation of the house on results.</p>

<p>BRANZ has had an active presence in weathertightness since the mid-1980s. This work intensified in 2003 in the form of a FRST (now MSI) funded programme in response to the leaky building problem. That programme focused on understanding the basic physics occurring in New Zealand walls</p>

<p>Daily electricity use varied widely in the initial analysis of a small number of buildings. Electricity use ranged from 7.1 kWh/day for a small shop to about 1,500 kWh/day for a large office building.</p>

<p data-block-key="4u0xu">Watergate Plus is a fire retardant, flexible synthetic wall underlay for use under direct-fixed and non-direct fixed wall claddings.</p>

<p data-block-key="r106f">Dunlop Express Wet Area Waterproofing is a premixed liquid-applied waterproofing membrane for use under ceramic or stone tile finishes in internal wet areas.</p>

<p data-block-key="8652l">Temperate coastal climate with four distinct seasons.</p>

<p data-block-key="ykbqg">Warm summers and cool winters.</p>

<p data-block-key="pug0z">Winstone Wallboards Limited fire rated timber wall systems with a timber penetration nominally 90 mm x 45 mm or larger. The penetration is fully framed within the wall and sealed with GIB Fire Soundseal® installed in the following GIB® systems:</p><ul><li data-block-key="6qdg8">GBUW 15</li><li data-block-key="9s9a6">GBTL30, GBTL 30b, GBTL 30c, GBTLA 30a, GBTLA 30b GBUW 30a, GBUW 30b, GWTLE 30, GWTLP 30 or GWUW 30</li><li data-block-key="clhat">GBTL 60, GBTL 60b, GBTLAB 60a, GBTLAB 60b, GBTLAB 60c, GBTLAB 60d, GBTLA 60, GWTLE 60a, GWTLE 60b or GWTLP 60</li><li data-block-key="c24ta">GBTL 90, GBTLA 90c or GBTLA 90d</li><li data-block-key="3u3jo">GBT 120a, GBT 120b or GWTE 120</li><li data-block-key="9dtr3">GBTL 120</li><li data-block-key="erp4v">GBUW 60 or GWUW 60</li><li data-block-key="fqfvl">GBUW 90</li><li data-block-key="9vkns">GBUW 120</li></ul>