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FIRM-FILL® 3310+

FIRM-FILL® 3310+

FIRM-FILL® 3310+, a premium poured floor underlayment from Hacker Industries, Inc., delivers best in class performance with compressive strengths from 3000-3900 psi. Ideal over wood or concrete subfloors in multi-family, hospitality, and renovation projects, FIRM-FILL® 3310+ maximizes sound control and creates an enhanced surface for finished floor coverings.


Recommended For


Features & Benefits

  • Easy application, fast setting; light traffic can return within hours
  • Over 105 UL listings; ICC-ES Legacy Report
  • Can be poured before or after drywall, as specified
  • Specify with FIRM-FILL® SCM acoustical control mats for improved acoustical performance
  • Meets ASTM F2419 and Tile Council of North America F180, F200
  • Installed by trained Licensed Applicators


Product Resources

Key: Word PDF Web Page
Product Submittal
3-Part Specifications
Project References
Drying Conditions Flyer
Post-Pour Instructions
Guidelines for Finished Floor Coverings

Featured Application

Collings Teen Center - West Sacramento, CA
The Grande at Riverdale - Morris County, NJ
Post Lake at Baldwin Park - Orlando, FL


Technical Data
Weight 7.6 lbs/ft2 at 3/4" (19 mm) C472M
Thickness 3/4" (19mm) (minimum over wood) to 3 1/2" (89mm); 1/2" (13mm) (minimum over concrete)  
Compressive Strength 3000 - 3900psi C472M
Thermal Performance K-value of 2.8 Btu/ft2·h·°F; R-value of 0.36 ft2·h·°F/Btu C177
Fire Hazard Classification Flamespread index 0; Fuel Contribution 0; Smoke Density 0 E84,
Patty Size 8 1/2" (approx. 216mm) plus or minus 1/2" (13mm) in diameter  
Sand 1/8" (3mm) or less washed plaster or masonry sand E11
UL listings Listed in over 100 1, 2, 3, and 4-hour floor/ceiling assemblies