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FIRM-FILL 3310  Green Building Product

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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