Publish your products
GYP-SPAN® Radiant | Gypsum Concrete Floor Underlayment
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
    Common.Footer.ValueProp.Image.AltText

    Design App for Revit

    Load families straight into your Revit model in one click

    Get a place to access new objects easier, store your Revit families and collaborate with your team.

    • CheckmarkWork directly with BIM objects next to Revit
    • Checkmark 2GB Cloud storage - store your Revit content
    • Checkmark Get embodied-carbon LCA (A1-A3) straight from Revit