In his guide, he details the difference between XPS (expanded polystyrene) and EPS (extruded polystyrene) and how each product’s closed cell and open cell nature affects the final board.

Jeffrey McNaught, owner of Edgewater Surf, hopes to reduce the amount of expanded polystyrene foam that ends up in landfills each year by converting it into a reusable construction material ... and ...

The first problem is the challenge of adding effective insulation within a structure ... project anyway … Simply lay sheets of extruded polystyrene foam on the existing roof deck, fastened ...

McNaught is also collecting extruded polystyrene foam, typically used for architectural insulation ... glue them up into a stack and then shape a board from that." The boards start in a "rough ...