Dupont's 1 in. x 4 ft. x 8 ft. Styrofoam ST-100 Square-Edge Insulation Board, Gray is built to handle structural demands with a 25 psi compressive strength rating, making it suitable for under-slab and load-bearing applications. The square-edge profile allows for tight seams and straightforward installation, helping create a continuous insulation layer. Lightweight yet durable, it is easy to cut and position on the jobsite, making it a practical choice for contractors focused on performance, efficiency, and long-term building envelope protection.
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