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Therma-Floor: The Ideal Underlayment for RadiantFloor Heat


Therma-Floor® is a gypsum underlayment by Maxxon® Corporation designed specifically for radiant floor heating systems. Poured over hot water tubes or electric heating cables, it’s the ideal thermal mass for any radiant floor system.

Therma-Floor: The Ideal Underlayment for RadiantFloor Heat

Therma-Floor encases the tubes or cables in noncombustible gypsum specially formulated to resist breakdown to 150 ˚F (66 ˚C). Poured only 11⁄4" (32 mm) thick, Therma-Floor also makes your heating system more stable — and your home more comfortable.

Some radiant systems install under plywood subfloors resulting in lost heat, as plywood is nearly 4 times more insulative than Therma-Floor. Therma-Floor works above the subfloor for greater efficiency and consistent comfort. Therma-Floor is an eco-friendly building product, and is GREENGUARD and GREENGUARD Gold certified.


  • Resists heat deterioration — it’s formulated specifically for radiant floor heating
  • Enhances heating system responsiveness due to its thin thermal mass
  • Provides a smooth, tough surface
  • Stiffens the floor
  • Seals perimeter walls, keeping out baseboard drafts
  • Eliminates squeaks and nail pops common to wood underlayments
  • Muffles sound transfer
  • Backed by a nationwide applicator network with over 4 billion square feet of installation experience
  • Accepts virtually all floor coverings
  • Contains no urea formaldehyde

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