Roof construction R-values will increase to R6.6 when New Zealand Building Code Acceptable Solution H1/AS1 5th edition becomes mandatory on 1 May 2023 (6 months later than first announced). Have you thought about how you will deal with these changes in your designs?
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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?
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.
A new wind zone category, extra high, has been added in the revised NZS 3604:2011 Timber-framed buildings, and the amended E2/AS1.
Another common feature of many leaky buildings that can be worth changing is the flush gable or the roof gable hidden behind a parapet.
Designers should be designing roofs with enough space between the roof underlay and top plate for the thicker ceiling insulation now commonly used. Here are some options to avoid getting caught short.
A common feature of many leaky buildings is that they were constructed without eaves, usually with walls terminating with a parapet. Changing this design detail can greatly enhance a building’s weathertightness.
A wall or roof underlay is very different from a vapour barrier. One lets moisture through and out of a building and the other doesn’t. Using the wrong one will trap moisture where you don’t want it.
When it comes to insulation, designers should think optimum rather than minimum and make key decisions early in the design process.
Don’t underestimate the importance of good design and orientation in determining how well a home invites in winter sun while dealing with peak summer heat. For established homes, there are also retrofitting options.
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