GYP-SPAN® Radiant

GYP-SPAN® Radiant is a gypsum concrete floor underlayment designed specifically for use over radiant heating systems. It encases the hot water tubes or electrical 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.

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Recommended For

Radiant Floor Heating Application/Market

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

Features & Benefits

  • 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

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

Log Cabin Resident, Near Grantsburg, WI
Parade of Homes – The Driver Residence in Bristol, IN

UL ListingsListed in over 100 1, 2, 3 and 4 hour floor/ceiling assemblies

Technical Data Properties ASTM
Weight 14.6 lbs/ft2 at 1-1/2″ (38mm) C472M
Thickness 1 to 1/2″
Thermal Performance K-value of 4.35 Btu//ft2·h·°F; R-value of 0.23 ft2·h·°F/Btu  C177
Fire Hazard Classification Flamespread index 0; Fuel Contribution 0; Smoke Density 0 E84
Sand 1/8″ (3mm) or less washed plaster or masonry sand E11
UL Listings Listed in over 100 1, 2, 3 and 4 hour floor/ceiling assemblies