Turns out Douglas fir is more than just a good-looking wood. Its durability and resistance to rot and insects make it a favorite choice for outdoor projects like porch decking as well. ... It's also naturally resistant to rot, decay, and insects.

Is Doug Fir rot resistant?

Rot Resistance: Douglas-Fir heartwood is rated to be moderately durable in regard to decay, but is susceptible to insect attack. Workability: Typically machines well, but has a moderate blunting effect on cutters. Accepts stains, glues, and finishes well.

What is the durability of Douglas fir?

Durability – Douglas fir is relatively durable, inherently resilient to fungal decay and other quality-decreasing factors. With life expectancy of well over 35 years, Douglas fir is regarded as a generally hardwearing species.