FIRM-FILL CMD Commercial / Institutional Floor Underlayment

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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 (1-9/16" total), FIRM-FILL® CMD reduces deadloads and thickness, significantly lowering costs.

Recommended Applications

Installed over corrugated steel deck in:

Multi-family
Commercial Projects
Industrial Buildings

Features and 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
Quick drying; can be walked on in 90 minutes
Expert application; installed only by trained, Licensed Applicators


Technical Data	Properties	ASTM

Weight	Minimum 12.8 psf (62.47 kg/m2) at 1-9/16" (40mm)	C-472 M

Thickness	1-9/16" (40mm)

Compressive Strength	Up to 3500 psi (24.1 MPa)	C-472 M

Fire Hazard Classification	Flamespread index 0; Fuel Contribution 0; Smoke Density 0	E-84

Patty Size	8" (203mm) plus or minus 1/2" (13mm) in diameter

Sand	1/8" (3mm) or less washed plaster or masonry sand	E-11

FIRM-FILL® CMD: Recommended Specifications | Project References

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