The original FIRM-FILL® Gypsum Concrete floor underlayment is designed for use in multi-family housing to satisfy acoustical ratings and fire codes. With excellent STC and IIC ratings as well as over 100 UL listings, FIRM-FILL® Gypsum Concrete floor underlayment is an excellent choice for jobs needing compressive strengths up to 2000 psi. Recommended for Multi-Family Application / Market Apartments, condominiums, hotels, motels, dorms, commercial buildings and commercial renovation projects.
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