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

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Technical Data	Properties	ASTM

Weight	6.5 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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