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FIRM-FILL® 3310+ | Floor Underlayment
FIRM-FILL® 3310+ | Floor Underlayment
FIRM-FILL® 3310+ | Floor Underlayment
FIRM-FILL® 3310+ | Floor Underlayment
FIRM-FILL® 3310+ | Floor Underlayment
    Hacker Industries

    FIRM-FILL® 3310+ | Floor Underlayment

    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

    • Multi-Family
    • Multi-Family Application / Market
    • Recommended for Multi-family, custom homes, commercial buildings, hotels & motels, & renovation projects.

    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
    Specification
    • Technical DataPropertiesASTM
      Weight7.6 lbs/ft2 at 3/4" (19 mm)C472M
      Thickness3/4" (19mm) (minimum over wood) to 3 1/2" (89mm); 1/2" (13mm) (minimum over concrete)
      Compressive Strength3000 - 3900psiC472M
      Fire Hazard ClassificationFlamespread index 0; Fuel Contribution 0; Smoke Density 0E84,
      E136
      Patty Size8 1/2" (approx. 216mm) plus or minus 1/2" (13mm) in diameter
      Sand1/8" (3mm) or less washed plaster or masonry sandE11
      UL listingsListed in over 100 1, 2, 3, and 4-hour floor/ceiling assemblies


    Technical specification
    • Unique ref.firm-fill-3310-plus-floor-underlayment
    • Product familyGypsum Cement Underlayment
    • Product groupGypsum Concrete Floor Underlayment
    • TypeObject (single object)
    • Date of publishing2026-06-09
    • Edition number1
    Links
    Related
    • 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

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