Expanded polystyrene[polystyrene?:cnc ps/polystyrene cutting machine] foam is the cheapest and least used foam board[foam board?:foam board] product on the market.
Expanded polystyrene foam typically has an R value of 3.6 to 4.0 per inch of thickness. Expanded polystyrene insulation is similar to the foam used for packing “peanuts” and it’s typically used for insulated concrete forms also knows as ICF’s.
Expanded polystyrene foam is also sometimes used on commercial buildings for roof and wall panel insulation which is typically sandwiched between light gauge metal.
