Apr 01, 2022 · 2 in. x 4 in. x 10 ft. #2 and Better PRIME Kiln-Dried Heat Treated Spruce-Pine-Fir Lumber As dimensional lumber, this 2 in. x 4 in. As dimensional lumber, this 2 in. x 4 in. x 10 ft. Spruce-Pine-Fir Lumber can be used for a wide range of structural and non-structural applications. The lumber features a smooth surface and will accept paint or stain.