Official website of the New Zealand Farm Forestry Association

Thermal Modification of Douglas fir for Improved Durability

By Rosie Sargent, May 2018.

Download SWP-T047 (pdf)

Executive summary

Douglas fir has been thermally modified at two temperatures; 220°C and 230°C (each for 2 hours).

These modifications are expected to improve the durability of the sapwood, while maintaining the durability of the heartwood. Fungus cellar (durability) testing of the modified wood is underway. Sufficient material has been thermally modified to allow future graveyard durability testing, if sufficiently good results are seen in the fungus cellar.


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