FIRM-FILL® CMD (Corrugated Metal Decking)

FIRM-FILL® CMD (Corrugated Metal Decking)

Green Building ProductDesigned 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


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


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

Candlewood Suites of Greenville, NC
Candlewood Suites of Fort Carson, CO


Technical Data
Weight Minimum 12.8 lbs/ft2 (62.47 kg/m2) at 1-9/16" (40mm) C472M
Thickness 1" (25mm) above the flutes  
Compressive Strength Minimum 3500 psi C472M
Fire Hazard Classification Flamespread index 0; Fuel Contribution 0; Smoke Density 0 E84
Patty Size 8-1/2 (216mm) plus or minus 1/2” (13mm) in diameter  
Sand 1/8" (3mm) or less washed plaster or masonry sand E11