Expanded Polystyrene is produced by expanding polystyrene beads, which are then bonded together to form rigid boards. “Bead Board’ as it is often called is manufactured in two densities. The high density board is more moisture resistant and can be used on the exterior of a foundation, providing the surrounding soil is dry and sandy. Polystyrene will ‘break down’ if left exposed to sunlight for prolonged periods. It must also be protected from solvents and only compatible adhesive & sealants should be used.
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