Pyramid Acoustic Soundproofing Material These 2'x2' square, open cell polyurethane acoustic foam panels have symmetrically identical beveled faces that disguise their seams from piece to piece. Available in standard 2, 3 and 4 inch thicknesses and 6 different colors, they yield one uniform look to a treated wall space, and boast excellent acoustic results. Ideal for any audio application where acoustics and aesthetics are both a must! Installation Instructions: Most customers glue these panels to a wall using silicone based caulk. For portability, you could opt to put them up with velcro strips or double stick tape. Cut the foam from the back side with a carpet cutter or utility knife. The most common way to install the panels are with a caulking gun and tubes of silicone adhesive. One tube for every 8 panels, or every 32 square feet. Other possible installation techniques may include double stick tape or velcro. Also, gluing the panels to plywood first and then bolting the panels to the wall is very popular. This allows you to eventually move the material. In addition, putting firring strips up on the wall first, and then bolting the plywood to the firring strips will create dead air space behind the foam. This will help enhance the acoustic affects of the application.