Bracing for monopitch roofs
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.
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Rafter fixings
Pitched roofs constructed with timber rafters are described in NZS 3604:2011 Timber-framed buildings as either couple-close or skillion roofs. What are the rafter fixing requirements?
Internal gutters
The best way to deal with internal gutters is to design them out, but sometimes, this isn’t an option. With good design and construction and ongoing maintenance, the risk of an internal gutter overflowing can be minimised.
Resilience costs
As the focus turns to improving resilience, BRANZ has assessed the costs of some common measures to make houses more resilient.
Sizing rafters
NZS 3604:2011 Timber-framed buildings sets out how to size rafters in table 10.1. The BRANZ technical helpline has received queries on doing this, so let’s step through some examples.
Constructing timber outriggers
Verge overhangs are the areas of a timber-framed roof that are most vulnerable to wind damage, so it’s important to get them right.
What’s hot and what’s not
Steel’s popularity as a structural element is rising, and there’s scope for more use of prefabrication. These are two of the trends BRANZ has identified for commercial building construction.
Stud substitution
There are rules around substituting studs with different sizes, but calls to the BRANZ
Helpline suggest some people are finding these confusing.
Built to last
The global weather forecast is daunting, and earthquakes are a regular event. With insurance costs already climbing, we badly need buildings that can stand up to the forces of nature.
External fire spread on houses
When residential buildings have a wall less than 1 m (or sometimes 5 m) from the boundary, there are requirements for the boundary walls to have specific fire resistance ratings (FRR) and exterior surface finishes.
