During the last 30 years, I have undertaken many investigations, surveys, arbitration's, and litigation, as an expert witness in building failures... In all that time I have found Douglas-fir to be a perfectly satisfactory timber for all framing above sub floor level, providing drainage, drying and deflection are adequately dealt with.
Roy Farris BRANZ advisor Central Otago

I have read the proposal put forward by the Douglas-fir industry, outlining certain conditions under which Douglas-fir could be considered. I personally consider this to be very appropriate...It allows a client the option to use untreated Douglas-fir as an alternative to treated pine.
Richard Carver Member NZ Institute of Architects