Shop for FOME-COR® SINGLESTEP® Board. FOME-COR® SINGLESTEP® is comprised of extruded polystyrene foam with clay-coated paper facers with one side covered with heat-activated adhesive. Standard sizes available. FOME-COR® SINGLESTEP® is sold in cartons of 25 sheets. Stocked materials typically ship in 2-5 business days. Can’t find what you need? Get a quote or learn more about foam boards.