Keeping skillion roofs dry
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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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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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.
By Malcolm Cunningham – 1 June 2003, Build 76
Only a very few types of roof require deliberate ventilation if all potential sources of moisture have been dealt with adequately. The BRANZ helpline still receives queries about whether to ventilate or not; so it’s time to have another look at this question.
By Tony Conder – 1 December 2004, Build 85
Roof bracing is one element in a continuum that provides resistance to horizontal loads. It works with the wall and foundation bracing to supply a total bracing package for a building.
By Alide Elkink – 1 June 2007, Build 100
Underlay is an essential part of roofing installation, but there still appears to be some uncertainty about its use and installation.
By Martin Connell – 1 August 2021, Build 185
Brick gable-ended roofs should be diagonally braced to prevent out-of-plane movement in an earthquake. It could make the difference between a home that remains liveable and one that does not.
By Roger Shelton – 1 June 2008, Build 106
The area around the edge of a roof requires extra fixings to stop it lifting, but how much of the total roof area needs these extra fixings?
By Alide Elkink – 1 June 2023, Build 196
How do you decide it is time to reroof a profiled metal roof? The answer is generally when the roof shows signs of corrosion and begins to leak.
By Alide Elkink – 1 December 2015, Build 151
Collecting rainwater for drinking can be practical, money saving and sometimes necessary. For safety’s sake, though, it’s important to have the correct set-up that is regularly maintained.
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.
By Alide Elkink – 1 April 2011, Build 123
The roof is usually the first thing to fail when a building is damaged in a severe storm. This risk can be minimised by making sure there are good structural connections.