For use over wood subfloors, FIRM-FILL® 2010 floor underlayment is the product of choice. It stiffens the subfloor to eliminate squeaks and nail pops and provides a solid floor while remaining safe for the environment. FIRM-FILL® 2010 floor underlayment creates additional surface hardness and compressive strengths up to 2500 psi.

• Custom Homes
• Light Commercial Buildings
• Hotels
• Renovation Projects

• FIRM-FILL® 2010 Floor Underlayment is designed for installation over wood subfloors
• Stiffens the subfloor to eliminate nail pops and squeaks
• Creates a smooth, flat, crack-free surface
• Compressive strengths from 1600 - 2500 psi
• Rapid installation; up to 40,000 square feet installed per day
• Quick drying; FIRM-FILL® 2010 Floor Underlayment can be walked on in 90 minutes
• Expert application; installed only by trained, Licensed Applicators
• FIRM-FILL® 2010 Floor Underlayment have approvals from ICC-ES and HUD
• Meets ASTM F2419, Standard Practice for the Installation of Thick Poured Gypsum Concretes and Preparation of the Surface to Receive Resilient Flooring.

Technical Data	Properties	ASTM
Weight	6.8 psf at 3/4"	C-472
Thickness	3/4" (19mm) (minimum over wood) to 3 1/2" (89mm)
Compressive Strength	1600 - 2500 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	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