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FIRM-FILL® CMD (Corrugated Metal Decking)
FIRM-FILL® CMD (Corrugated Metal Decking)

    FIRM-FILL® CMD (Corrugated Metal Decking)

    Designed for use in multi-family, commercial and institutional buildings with light-gauge steel framing and a corrugated steel deck, FIRM-FILL® CMD is a lightweight, high-strength gypsum concrete floor underlayment. Installed at 1" above the top of the flutes, FIRM-FILL® CMD reduces deadloads and thickness, significantly lowering costs.

    Recommended For

    • Corrugated Metal Decking Application / Market: Multi-family, commercial projects, & industrial buildings

    Features & Benefits

    • Lightweight solution for fast-track construction
    • Ideal for multi-family and mid-rise commercial applications
    • Economical solution to build higher, faster, and lighter
    • Creates a smooth, flat, rock-solid surface for the installation of finished floor coverings
    • UL listed for 1, 1-1/2, and 2-hour fire-resistance per UL G565, G568
    • Quick drying; can be walked on in 90 minutes
    • Expert application; installed only by trained, Licensed Applicators
    Specification
    • Technical DataPropertiesASTM
      WeightMinimum 12.8 lbs/ft2 (62.47 kg/m2) at 1-9/16" (40mm)C472M
      Thickness1" (25mm) above the flutes
      Compressive StrengthMinimum 3500 psiC472M
      Fire Hazard ClassificationFlamespread index 0; Fuel Contribution 0; Smoke Density 0E84
      Patty Size8-1/2 (216mm) plus or minus 1/2” (13mm) in diameter
      Sand1/8" (3mm) or less washed plaster or masonry sandE11


    Technical specification
    • Unique ref.firm-fill-cmd-corrugated-metal-decking
    • Product familyGypsum Cement Underlayment
    • Product groupCorrugated Metal Deck Underlayment
    • TypeObject (single object)
    • Date of publishing2026-03-02
    • Edition number1
    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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