Our Polystyrene (Styrofoam) ceiling planks are one of the fastest and easiest ways to cover the popcorn ceilings and enhance any room's decor. All you need to do is glue the ceiling planks directly over the popcorn. The planks have beveled edges for an easy butt joint installation. Beside popcorn, Styrofoam ceiling tiles could be installed over pretty much any flat solid surface (plywood, drywall, concrete etc').