FIRM-FILL® Gypsum Concrete Floor Underlayment

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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 83 UL listings, FIRM-FILL® Gypsum Concrete floor underlayment is an excellent choice for jobs needing compressive strengths up to 2000 psi.

FIRM-FILL® Gypsum Concrete Floor Underlayment Recommended Applications

Multi-Family Housing

Condominiums
Apartment Buildings
Townhomes

FIRM-FILL® Gypsum Concrete Floor Underlayment Features and Benefits

Flattens subfloors
Provides excellent STC (sound transmission) and IIC (impact isolation) ratings
Possesses over 83 UL listings
Lightweight and crack resistant
Easily installed; over 40,000 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


Technical Data	Properties	ASTM

Weight	7 psf at 3/4"	C-472

Thickness	3/4" (19mm) (minimum over wood) to 3 1/2" (89mm)

Compressive Strength	1200 - 2000 psi	C-472

Thermal Performance	K-value of 2.45 Btu; R-value of 0.41 ft2.h.°F/Btu	C-177-76

Fire Hazard Classification	Flamespread index 0; Fuel Contribution 0; Smoke Density 0	E-84

Patty Size	8" (203mm) plus or minus 1/2" (13mm) in diameter

Sand	1/8" (3mm) or less washed plaster or masonry sand	E-11

UL listings	Listed in over 83 1, 2, 3 and 4 hour floor/ceiling assemblies

FIRM-FILL® Gypsum Concrete: Recommended Specifications | Project References

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