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===Foam=== {{unsourced section|date=December 2024}} [[File:Celotex thermax foamed plastic sheets.jpg|thumb|upright|Foamed plastic sheet to be used as backing for [[Mortar (firestop)|firestop mortar]] at CIBC bank in [[Toronto]].]] Recently, synthetic [[polystyrene]] or [[polyurethane]] foam has been used in combination with structural materials, such as concrete. It is lightweight, easily shaped, and an excellent insulator. Foam is usually used as part of a [[structural insulated panel]], wherein the foam is sandwiched between wood or cement or insulating concrete forms.
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