This is as true for insulation board as it is for the ubiquitous expanded polystyrene kind of foam used for everything from coffee cups to packaging material. Those stick-type hot wire cutters ...

Jeffrey McNaught, owner of Edgewater Surf, hopes to reduce the amount of expanded polystyrene foam that ends up in landfills ...

Polystyrene foam is still being sold in the state of California despite a ban that went into effect on Jan. 1, 2025. (Susanne Rust/Los Angeles Times) Same with the restaurant supply shop KaTom ...

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.