1/4"-4' x 4' POWERFLEX UNDERLAYMENT | 1/4"-4'x4' PowerPlex is a 5-ply agathis plywood serving as an ideal underlayment for vinyl sheet, vinyl composition tile, carpet, and other traditional floor coverings. Its unique 5-ply construction makes it indentation resistant, dimensionally stable, non-staining and completely void free. As with all wood products, proper storage and handling will ensure the best performance and a trouble-free installation. PowerPlex's nailing pattern helps make sure the panels are installed properly.