FIRM-FILL® Gypsum Concrete | Floor Underlayment

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 105 UL listings, FIRM-FILL® Gypsum Concrete floor underlayment is an excellent choice for jobs needing compressive strengths up to 2200 psi.

Recommended For

• Multi-Family Application / Market: Apartments, condominiums, hotels, motels, dorms, commercial buildings and commercial renovation projects.

Features & Benefits

• Flattens subfloors
• Provides excellent STC (sound transmission) and IIC (impact isolation) ratings
• Possesses over 105 UL listings
• Lightweight and crack resistant
• Easily installed; over 25,000 square feet can be installed per day
• Quick drying; can be walked on in 90 minutes
• Expert application; installed only by trained, Licensed Applicators
• Approvals from ICC-ES and HUD
• Meets ASTM F2419, Standard Practice for the Installation of Thick Poured Gypsum Concrete Underlayments and the Preparation of the Surface to Receive Resilient Flooring