FIRM-FILL® 4010 floor underlayment is designed for thin capping of concrete in new construction or over damaged concrete in renovation projects. FIRM-FILL® 4010 floor underlayment's high strength and superior bonding characteristics will provide concrete floors with new life and exceptional surface hardness, offering compressive strengths ranging from 4000 to 5200 psi.


Recommended For


Features & Benefits

  • FIRM-FILL® 4010 floor underlayment has exceptional compressive strengths from 4000 to 5200 psi
  • FIRM-FILL® 4010 floor underlayment is cost efficient
  • Creates a smooth, flat, crack-resistant surface
  • Rapid installation; up to 25,000 square feet installed per day
  • FIRM-FILL® 4010 floor underlayment requires no troweling
  • Unique bonding capabilities
  • Proven performance and durability
  • Quick drying; can be walked on in 90 minutes
  • Expert application; installed only by trained, Licensed Applicators


External Resources

Sweets ProductTAG
CAD Details


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

SearStone-Calais Terrace and Lorraine Plaza in Cary, NC
Hilton Gardens Hotel of Indianapolis, IN


Technical Data
Weight 7.8 lbs/ft2 at 3/4" (19 mm) C472M
Thickness Feather edge in transitions to 2" (51mm)  
Compressive Strength 4000 to 5200 psi C472M
Fire Hazard Classification Flamespread index 0; Fuel Contribution 0; Smoke Density 0 E84,
Patty Size 7 1/2" (191mm) to 9” (229mm) plus or minus 1/2" (13mm) in diameter  
Sand 1/8" (3mm) or less washed plaster, masonry sand or silica sand E11
UL listings Listed in over 100 1, 2, 3 and 4 hour floor/ceiling assemblies