The Right Stuff

Practical how-to articles for builders and designers showing good industry practice and interpretation of the NZ Building Code and standards.

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Keeping skillion roofs dry

1 October 2005, Build 90

For most skillion roofs the amount of air movement in the roof cavity, although limited, is sufficient to remove small amounts of vapour. The trick is to keep those amounts of water vapour small.

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Roof drainage design

By Greg Burn 1 October 2009, Build 114

The roof on a new building needs to be more than just aesthetically appealing and able to keep the building weathertight – it must also effectively collect and dispose of rainwater.

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Internal gutter design

By Trevor Pringle 1 June 2007, Build 100

Internal or ‘within roof area’ gutters (also described as box gutters) are seen as an easy solution to the collection and disposal of roof water. However, significant inconvenience, damage and health issues may occur if one overflows.

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Dragon ties revisited

By Roger Shelton 1 February 2021, Build 182

While the use of dragon ties in New Zealand residential construction has decreased over recent decades, they remain a simple and cost-effective method to provide bracing solutions to larger rooms. However, BRANZ helpline queries suggest there is still some confusion around when they should be used.

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