Prova Flex-Heat+ Tile Underlayment per SF for Heated Floors

Prova Flex-Heat  Tile Underlayment per SF for Heated Floors by Loxcreen


Prova Flex-Heat Flex-Heat+ Tile Underlayment and Crack Isolation Membrane for heated floors 1 SF 99 cm or 3.24 feet wide

  • Per SF - High-performance easy-to-install crack isolation underlayment for radiantly heated tile and stone
  • Can be used with multiple wire sizes up to 0.2" (5mm) thick
  • 1" between cable channels offers infinite wire spacing layouts
  • Waterproof underlayment is 0.24" thick - use with or without heat cable

Prova Flex-Heat+ Install

Prova Flex-Heat+ Tile Underlayment sold per SF for Heated Floors

Material is 3.24 ft wide (38.75" or 99 cm) and is SOLD BY SQUARE FOOT (SF). One SF of material will be approximately 38.75 inches x 3.7 inches. If you know how many linear feet you need, multiply by 3.24 and round up to nearest SF (e.g. 10 LF = 10 x 3.24 = 32.4 SF - order 33 SF) Knowing that the material is 3.24 feet wide, it is best to plan how many linear feet of material you need based on that dimension then calculate SF on length of material rather than the exact amount of SF in your workspace.


  • Easiest possible all-in-one tile/stone anti-crack underlayment for installing electric radiant heating wire
  • Can use any brand heating wire with multiple wire thickness up to 0.2" (5 mm)
  • Wire channel spacing is in 1" increments allowing popular wiring layouts of 2, 3, 4 or other inch spacings
  • Use modified or fortified thin-set mortar of your brand choice and quality (good, better, best)
  • Installation with modified thin-set mortar provides higher installation performance versus unmodified installs
  • Will not rot or crack and is impervious to most substances.
  • With Shear-Stress Control - bridges cracks and provides an isolation layer to prevent cracking of tile surface.
  • Can be laid over a variety of substrates.
  • Can be used as an XL anti-crack membrane without wire installation for better matching thick adjacent surfaces like hardwood
  • Vapor Management System - deep groove air channels beneath the fleece layer provide a path for moisture to dissipate
  • Well suited for below-grade applications
  • Entire floor can be 100% waterproofed by adding a 5, 7 or 10 inch wide WP waterproofing band over the seams (with modified thin-set)

Suitable Substrates

  • Concrete
  • Wood Based plywood or OSB
  • Synthetic flooring and surface coatings
  • Gypsum based (anhydrite) screeds
  • Bituminous Screed

Additional Information


ProVa Flex_Heat+ is a 0.24" thick (height) polypropylene membrane factory bonded to a white one-ply non-woven fleece on the underside to maximize bonding to the subfloor.

ProVa-Flex is lightweight, flexible, bridges cracks, does not rot and is highly resistant to solutions containing salts, acids, and alkalis, as well as many organic solvents, alcohols and oils. It is highly impervious to steam. An installation can be completely waterproofed by applying 5, 7 or 10 inch WP band waterproof membrane over all joint seams and edges.

Prova Flex-Heat+ holds your choice of electric radiant floor heating wire and also provides the only necessary underlayment for ceramic tiles and natural stone - replacing other products like concrete board. This all-in-one solution greatly simplified installation while providing maximum performance. This underlayment provides "uncoupling" performance on all suitable substrates and water vapor pressure equalization to address possible moisture in the substrate below. Prova Flex-Heat+ offers flexibility for your installation requirements. It can be installed and then tiled later after it's dry or tile can be installed immediately after the underlayment and wire placement phases are completed.


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