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Determinations issued, Codewords, February 08, issue 025
By Department of Building and Housing, February 2008.
Download Codewords_25_Feb08 (pdf)
Executive summary
The six determinations have established certain criteria to decide whether macrocarpa, or Lawson or Mexican cypress timbers, are Code-compliant when installed to the exterior of buildings.
Such timbers are the equivalent to structural-grade radiata pine treated to Hazard Class H3.2, and therefore comply with Clause B2 of the Building Code if:
- they are heart timbers
- they are not in contact with the ground
- they are relatively easy to replace
- their surfaces are treated with an appropriate preservative
- their cut ends are similarly treated or suitably capped
- they have a durability of at least
50 years according to Clause B2.3.1 (a)(i).
Determination No 2004/10: Durability of untreated timber veranda posts
Determination No 2004/71: Heart macrocarpa veranda posts
Determination No 2007/97: Exposed heart macrocarpa posts and beams to a house
Determination No 2007/99: Code compliance of macrocarpa posts and rafters installed in a house
Determination No 2007/129: The durability of Lawson cypress posts and beams to a cottage
Determination No 2007/129: Heart macrocarpa posts and decking to a house
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