FIRM-FILL® 4010 | Floor Underlayment

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

Concrete Toppings & Self-Levelers: New concrete & cracked or damaged concrete.

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

Specification

Technical Data	Properties	ASTM
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, E136
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

Technical specification

Unique ref.firm-fill-4010-floor-underlayment
Product familyGypsum Cement Underlayment
Product groupGypsum Concrete Floor Underlayment
TypeObject (single object)
Date of publishing2026-03-02
Edition number1

Links

Product urlhttps://hackerindustries.com/firm-fill-4010.shtml
Installation instructionshttps://hackerindustries.com/pdfs/Firm-Fill-Post-Pour-Instructions.pdf
Technical descriptionhttps://hackerindustries.com/3-part-specs/FF_4010+_Specs.pdf

Designed inUnited States
Manufactured inUnited States

Classification

BIMobject CategoryFlooring - Underlay
CSI MasterFormat 2014 Code03 54 13
CSI MasterFormat 2014 TitleGypsum Cement Underlayment
OmniClass Number23-15 17 11 13
OmniClass TitleFloor Underlayments

Region availability

North America
Anguilla
Antigua and Barbuda
Aruba
Barbados
Belize
Bermuda
British Virgin Islands
Canada
Caribbean Netherlands
Cayman Islands
Collectivity of Saint Martin
Costa Rica
Cuba
Curaçao
Dominica
Dominican Republic
El Salvador
Greenland
Grenada
Guadeloupe
Guatemala
Haiti
Honduras
Jamaica
Martinique
Mexico
Montserrat
Nicaragua
Panama
Puerto Rico
Saint Kitts and Nevis
Saint Lucia
Saint Pierre and Miquelon
Saint Vincent and the Grenadines
Saint-Barthélemy
Sint Maarten
The Bahamas
Trinidad and Tobago
Turks and Caicos Islands
U.S. Virgin Islands
United States