The gen on green roofs
They deliver substantial environmental gains, so while New Zealand is slow to jump on the green roof bandwagon, there’s reason to think this will change.
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Bracing for monopitch roofs
By Alide Elkink – 1 December 2014, Build 145
Judging by the number of calls to the BRANZ Helpline, there’s some confusion around bracing requirements for monopitch roofs. Here, we sort out the issue.
Don't be cool about warm roofs
By Alide Elkink – 1 August 2017, Build 161
While they may be more expensive to install, the popularity of warm roofs is growing as they are more thermally efficient, resulting in lower energy costs.
Membranes for low-slope roofs
By Alide Elkink – 1 April 2017, Build 159
Building consent authorities are finding roofing systems specified for low-slope roofs that are unsuitable for the expected traffic use. What membranes can be used on roofs with regular maintenance foot traffic?
H1 and sloping truss roof options
By Alide Elkink – 1 August 2022, Build 191
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?
Roof bracing
By Tom Edhouse – 1 February 2013, Build 134
We complete this four-part Build series on calculating bracing requirements by looking at roof bracing.
Edge detailing for membrane roofs
By Trevor Pringle – 1 June 2012, Build 130
Don’t be misled into thinking that rubber roofing membranes can do without edge detailing. It’s required in E2/AS1, and omitting it can lead to stained walls.
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.
Flashing a timber-framed chimney
By Ann Galloway – 1 February 2017, Build 158
Chimneys obstruct rainwater flowing off a roof and need to be well detailed and flashed to prevent problems.
Extra high wind zone
By Alide Elkink – 1 February 2012, Build 128
A new wind zone category, extra high, has been added in the revised NZS 3604:2011 Timber-framed buildings, and the amended E2/AS1.
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