Pressure-treated wood is wood that has been treated with preservatives. This protects wood from insects and decay and is ideal for projects where wood is exposed to the elements or excessive moisture. Wood preservatives are registered with the Environmental Protection Agency for their safe use.
Pressure-treated softwood lumber includes Southern Pine, Ponderosa Pine, Douglas fir and Hem-fir. Learn more:
Southern Forest Products Association: Pressure-Treated Southern Pine
Western Wood Preservers Institute: Wood Use Categories Infographic
Western Wood Products Association: