Assignment 2

what type of timber is used in the construction industry and what is involved in treating the wood?.

The tiypes on timber used during construction:

• Rimu
• Radiota Pine
• Fijian kauri
• Oak
• Kwila
• Balau
• macrocarpa
• Eucalypt Species

For timber framed buildings most of the timber used must be treated to prevent damages within the wood by insects and moisture. the treatment is accordance with nzs 3640 which will normally be:

• Baron salts (H1.1, H1.2)
• Light organic solvent persavative (H.1, H1.2, H3.1, H3.2)
• Copper chrome asenate (H3.2, H4, H5, H6)
• Amoniacal or alkaline copper quaternary (H3.1, H3.2, H4, H5)
• Copper Azole (H3.1, H3.2, H4)

When using copper - based treated timber for exposed situation:

• site treat cut ends
• do not place cut ends in the ground
• do not burn off - cuts on barbecues or in domestic fireplaces

H1.1 - framing to external wall clad with masonary

H1.2 - enclosed subfloor framing

H3.1 - exterior plywood- painted

H3.2 - exposed subfloor - unpainted

H4 - exposed subfloor framing

H5 - veranda posts in the ground.