FIRM-FILL® 3310 Floor Underlayment

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An innovative new product that elevates gypsum concretes to an unprecedented level of rock-solid performance. FIRM-FILL® 3310 floor underlayment's fast-setting surface rapidly eliminates water allowing for accelerated drying time and unparalleled levels of strength and finish over wood and concrete subfloors in new construction and renovation projects.

FIRM-FILL® 3310 Floor Underlayment Recommended Applications

Over subfloors in:

Multi-Family
Custom Homes
Commercial Buildings
Hotels & Motels
Renovation Projects

FIRM-FILL® 3310 Floor Underlayment Features and Benefits

Premium strength, smooth surface over wood and concrete subfloors
Eliminates water rapidly for accelerated drying time
FIRM-FILL® 3310 Floor Underlayment can be poured before or after drywall
Exceptional compressive strengths from 2000 to 3300 psi
Delivers fire resistance and improved sound performance
FIRM-FILL® 3310 Floor Underlayment creates a smooth, crack-resistant surface
Expert application; installed only by trained, Licensed Applicators
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	7.6 psf at 3/4"	C-472

Thickness	3/4" (19mm) (minimum over wood) to 3 1/2" (89mm); 1/2" (13mm) (minimum over concrete)

Compressive Strength	2000 - 3300 psi	C-472

Thermal Performance	K-value of 2.8 Btu; R-value of 0.36 ft2.h.°F/Btu	C-177-76

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

Patty Size	7 1/2" (approx. 191mm) 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 86 1, 2, 3, and 4-hour floor/ceiling assemblies

FIRM-FILL® 3310: Recommended Specifications | Project References

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