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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
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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