GYP-SPAN® Radiant is a gypsum concrete floor underlayment designed specifically for use over radiant heating systems. It encases the tubes or cables without air bubbles, creating a superior thermal mass that provides uniform heat transfer. GYP-SPAN® Radiant floor underlayment is the energy efficient and cost effective way to create a smooth, flat, evenly heated floor surface for the attachment of virtually any finished floor covering.

Installed over radiant heating systems (electric cables or hot water tubes)

• Provides superior thermal mass for uniform heat transfer
• Adheres to tubes or cables without air bubbles, dries without shrinkage cracks
• GYP-SPAN® Radiant Floor Underlayment helps seal room perimeter for increased energy efficiency
• Creates smooth, flat surface for the installation of finished floor goods
• Used in "Green" construction
• Quick drying; can be walked on in 90 minutes
• Expert application; installed only by trained, Licensed Applicators
• GYP-SPAN® Radiant Floor Underlayment has approvals from ICC-ES 4147 and HUD

Technical Data	Properties	ASTM
Weight	14 psf at 1-1/2" (38mm)	C-472
Thickness	1-1/2" (38mm)
Compressive Strength	2000 - 3200 psi	C-472
Thermal Performance	K-value of 4.35 Btu; R-value of 0.23 ft2.h.°F/Btu	C-177-76
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
UL listings	Listed in over 83 1, 2, 3 and 4 hour floor/ceiling assemblies