EPS Styrofoam sheet 4 feet x 4 feet x 1 Inch Thickness
Styrofoam is produced from polystyrene beads, which when expanded and molded under controlled conditions form a light weight block.
EPS have some of the strongest waterproofing properties of all insulation
EPS is also susceptible to crumbling on the edges.
EPS is used for soundproofing, waterproofing, insulation and also in expansion joints