FIRM-FILL Gypsum Concrete
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,
Hacker Industries Inc
FIRM-FILL Gypsum Concrete floor underlayment is an excellent choice for jobs needing compressive strengths up to 2000 psi.