Tongue & Groove 1/2" - 20

This 1/2" - 20 tongue & groove siding measures .500" in thickness; the widths get adjusted to any desired size during the milling process. The profile is comprised of a 5/32" wide by 1/8" tall groove, with a 1/8" wide by 1/8" tall chamfer on the side edge with .006" void area in the joint for expansion and contraction of the wood during seasonal changes in relative humidity. When two pieces of finished milled lumber join; they create a 1/4" wide by 1/8" deep vee groove on one face side of the merged boards.