Roles

Urethane foams are also a two-part mixture, like urea-formaldehyde foams for concrete blocks, except they're very adhesive and they expand.

Foamed-in-place insulation weighs little more than 0.8 pounds per cubic foot after a few days of drying. When properly formulated and mixed, the water is bonded into the finished formulation. The finished product dries through vaporizing. A good test of