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GYP-SPAN® Radiant | Gypsum Concrete Floor Underlayment

GYP-SPAN® Radiant | Gypsum Concrete Floor Underlayment

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.

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
Specification
  • Technical DataPropertiesASTM
    Weight14.6 lbs/ft2 at 1-1/2" (38mm)C472M
    Thickness1-1/2" (38mm)
    Compressive Strength2000 - 3200 psiC472M
    Thermal PerformanceK-value of 4.35 Btu/ft2·h·°F; R-value of 0.23 ft2·h·°F/BtuC177
    Fire Hazard ClassificationFlamespread index 0; Fuel Contribution 0; Smoke Density 0E84
    Patty Size7 1/2" (191mm) plus or minus 1/2" (13mm) in diameter
    Sand1/8" (3mm) or less washed plaster or masonry sandE11
    UL listingsListed in over 100 1, 2, 3 and 4 hour floor/ceiling assemblies
Technical specification
  • Unique ref.gyp-span-radiant-gypsum-concrete-floor-underlayment
  • Product familyRadiant Floor Underlayment Systems
  • Product groupGypsum Radiant Heating Underlayment
  • TypeObject (single object)
  • Date of publishing2026-03-02
  • Edition number1
Related
  • Designed inUnited States
  • Manufactured inUnited States
Classification
  • BIMobject CategoryFlooring - Underlay
  • CSI MasterFormat 2014 Code23 83 16
  • CSI MasterFormat 2014 TitleRadiant-Heating Hydronic Piping
  • 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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