If you’re interested in insulating with styrofoam, note that styrofoam insulation is a type of extruded insulation Polyisocyanurate is another option, coming in as the densest and most expensive option for foam board. It’s more than just foam cups Learn about eps, xps, and #4 styrofoam, their differences, and whether they can be recycled. Styrofoam™ is a registered trademark of the dupont chemical company (“dupont”) or an affiliated company of dupont The trademark covers a full range of extruded polystyrene building products used primarily for insulation of floors, walls and roof systems.
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