Specialty Timbers New ZealandSearch technical reports
The Decay resistance of Douglas fir, Macrocarpa, Lawson Cypress and European Larch Framing - Summary of Results after 52 weeks Exposure
By Mick Hedley, November 2005.
Download Mick_Hedley_BRANZ_52_week_mould_decay_trial (pdf)
Executive summary
Short pieces of 90 x 45mm framing timber of Douglas fir (Pseudotsuga menziesii), European larch (Larix decidua), Lawson cypress (Chamaecyparis lawsoniana), macrocarpa (Cupressus macrocarpa) and radiata pine (Pinus radiata) were inoculated with brown rot decay fungi and installed in filleted stacks in sealed tanks. The groups included heartwood, sapwood, LOSP treated and boron treated samples.
After 12 months there was severe decay in the untreated radiata pine and in the untreated sapwood of the other species. Decay was becoming established in the untreated heartwood of Douglas fir and larch but only isolated minor spots on the macrocarpa and Lawson cypress. There was isolated light decay in LOSP treated Lawson cypress and macrocarpa, mainly at the joints.
Please note the three year results can be found here ».
No posts yet
Add a post