Durability of New Zealand grown timbers

Authors: David Page, Tripti Singh
Publication: New Zealand Journal of Forestry, Volume N.Z.J.For. 2013, Issue N.Z.J.For. 58(4) 2014, pp 26-30, Jan 2014
Publisher: New Zealand Institute of Forestry

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Abstract: Data collected over many years and from field sites throughout New Zealand were used to classify the durability of timber from locally grown species. The durability classifications were based on in-ground tests of small stakes. The suitability of individual species for a range of end uses has been measured using a combination of field and ‘in-service’ tests around the country. These data support the use of naturally durable species as an alternative to preservative treated radiata pine. Suggested uses for the species, their suitability to meet the requirements of NZS 3602 (2003) and likely limitations are discussed. While the in-ground durability classification provides a useful guide for above-ground uses other factors such as coatings, orientation and exposure to rainfall have a major influence on the durability of components in above-ground situations. Timber from naturally durable species exhibits more variable resistance to decay organisms than that from radiata pine treated commercially with preservatives. We found that the durability classification of some locally grown timbers may be different to that of imported timber of the same species.

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