As a lightweight closed cell foam, EPS (expanded polystyrene, aka Styrofoam, Beadboard) is very popular for countless crafts and projects that call for high density closed cell foam and it’s easy to work with. The unique structure of closed cell foam sheets , or any other form of EPS, allows almost total resistance from moisture and water vapor. Polystyrene foam will not rot or attract fungi or mildew. Also, EPS has a superior R-value, so polystyrene sheets will insulate and keep heating or cooling inside of any particular room or commercial space.
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