The Department of Building and Housing has advised that the accreditation of the building product TimberSaver boron remains in place - 12 Jul 2005
Concerns have been raised with the Department about the use of TimberSaver boron and these are being actively investigated. However, to date there is no evidence of any problems with the product.
TimberSaver boron is accredited for use as an alternative where H1.1 and H1.2 timber is required under New Zealand Standard 3602:2003.
When considering a building consent application territorial authorities must allow use of an accredited product, subject to the conditions specified on the certificate.
Particular conditions of use of TimberSaver boron treated timber include that it must:
- be limited to treating framing timber up to a maximum of 45 mm thick and maximum 290 mm wide.
- only be used where the in-service moisture content is 20% or less and the timber is not exposed to the elements or subject to regular wetting.
- be stored under cover and clear of the ground.
- not be exposed to the weather for longer than 2 months, including all periods of storage, transportation and construction.
- have cut ends more than 1.5 x cross-sectional area of the timber and bored holes greater tan 25 mm diameter, liberally coated on-site with brush-on PROTIM® FrameSavertm.
- be site treated as described above where machining, rebating, notching, ripping or planning of surfaces occurs.