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FOAMULAR® 150 is Owens Corning's standard-duty extruded polystyrene (XPS) board with 15 PSI compressive strength. Ideal for wall sheathing, basement and crawlspace walls, and under-slab applications where moderate load resistance is required. Available in R-3 through R-20, ½ in. to 4 in. thick. Authorized distributor.