Selecting timber framing
A designer needs to select the right timber for their design. This means choosing the correct level of treatment for the situation and the right grade for the spans and loadings nominated.
Framing
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Bottom plate anchors
By Roger Shelton – 1 February 2008, Build 104
Calls to the BRANZ Helpline indicate that there is still confusion about the correct use of bottom plate anchors with concrete floor slabs.
Sizing rafters
By Tom Edhouse – 1 June 2014, Build 142
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.
Sizing up holes and notches
By Alide Elkink – 1 December 2017, Build 163
Holes or notches are sometimes required in timber framing members, but they must be carefully located so they do not undermine structural integrity.
Residential steel framing
By Carl Davies – 1 February 2009, Build 110, Feature article
Although steel framing has a tiny market share in the local housing industry, the National Association of Steel-framed Housing (NASH) believe it’s popularity will grow as its benefits become better known.
Veranda rafter fixings
By Roger Shelton – 1 April 2018, Build 165
The BRANZ helpline often gets asked about fixings for veranda rafters. These are not covered in NZS 3604:2011, but BRANZ has some advice.
Dwangs – moving with the times
By Bruce Sedcole – 1 February 2020, Build 176
The need for dwangs, those horizontal blocking pieces used between wall studs, has lessened over the years. Using fewer dwangs and making them narrower than the studs could improve a building’s thermal performance.
H1.2 framing timber treatment
By Alide Elkink – 1 October 2011, Build 126
A single, boron-based treatment class, H1.2, may now be used for almost all enclosed timber framing. This has simplified framing timber, but have treatment processes or on-site handling changed?
Built-up members
By Alide Elkink – 1 December 2018, Build 169
Jack studs and bottom and top plates must be solid timber members, but NZS 3604:2011 lets other solid timber members be replaced by built-up members. However, these need to be done correctly.
X-Frame and the circular economy
By Gerard Finch – 1 December 2019, Build 175, Feature article
More thought is needed on how the construction industry, known for its waste, can fit into the circular economy. In New Zealand, timber framing technology is being developed that allows for future reuse.
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