Alternative Timbers

This paper gives guidance on what structural properties and durability to expect from New Zealand-grown species that are not listed in NZS3603. For structural properties the derivation of characteristic stresses from small clears data is described. Because the property that usually determines the size ofmember required is modulus of elasticity, the mean small clears value is applied directly. For durability, the species are listed in four classes, according to observed performance of those species in ground contact.