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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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.
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.
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.
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.
The BRANZ Helpline regularly receives enquiries about when strapping must be used to tie the timber framing together. These tips should point you in the right direction.
There are rules around substituting studs with different sizes, but calls to the BRANZ
Helpline suggest some people are finding these confusing.
Although steel framing in domestic construction has only a small market share, there are signs it may be on the increase. Since steel is a good conductor, builders need to be aware of potential pitfalls, such as thermal bridges and condensation.
The treated timber framing system that came into effect on 4 April this year allows a single hazard class, H1.2, to be used for all enclosed radiata pine and Douglas fir framing.
The correct fixings are needed at the various junctions of a timber-framed building structure to resist uplift in windy conditions. In this article, we summarise where to find them in NZS 3604:2011 and what is required.