For its dimensional stability, high strength-to-weight ratio, nail-holding capability, and other properties, Douglas fir is prized as a structural lumber. It is not easily treated by waterborne preservative systems, but the ammonia and heat used in the ACZA treating process enable Chemonite® preservative to provide effective protection of the wood.
Douglas fir is not a true fir, but comprises several species in their own genus, Pseudotsuga. There are differences among these species and even within them. For some applications, AWPA standards distinguish between coastal Douglas fir (grown between the Pacific Ocean and the summit of the Cascade Mountains) and interior Douglas fir.
ACZA treatment can also effectively protect other species, including red pine, eastern white pine, ponderosa pine, jack pine, spruce, western red cedar, northern white cedar, and lodgepole pine.
