Per the federal regulations contained in 49 CFR Part 26, Electronic Code of Federal regulations, a DBE is a for-profit small business concern that is: 1  At least 51 percent owned by one or more individuals who are both socially and economically disadvantaged.
Use a piece of lumber as a smash block to protect the plywood tongue. Smash the additional pieces of plywood in place. Installing Plywood Subfloor: Leveling and Finishing
With the plywood in place, install the backer board as you normally would. To avoid building up the floor too high, you can use 1/4-in.-thick backer board instead of 1/2-in. backer.ooden subfloors in older houses need to be strengthened and stabilized before backer board and tile are installed. The best method is to refasten the subfloor, then add a layer of plywood.