ThermoSphere Ultimate HDM-015 decoupling membrane roll — dimpled uncoupling matting for tile installation over heated and problem substrates
1m² sheet of ThermoSphere Ultimate Decoupling Membrane — main packshot of the polyethylene anti-fracture matting for tile installation over heated subfloors.
A bright blue Thermosphere ultimate mat shown partially unrolled from a roll on a plain white background.
A person's hands peeling back a white protective film from a blue Thermosphere self adhesive ultimate matting for underfloor heating, ready to lay onto green chipboard flooring.
ThermoSphere Ultimate decoupling membrane — application diagram showing tile installation build-up
ThermoSphere Ultimate decoupling membrane — underside fabric detail for substrate bonding
A close-up of a person's hand fixing a yellow heating wire into a blue Thermsophere ultimate mat with a small black component near the top left, against a white background.
A close-up of a person's hand fixing the yellow Thermosphere ultimate heating cable into place on the ultimate matting
A close-up of a hand using a grout float to place Thermosphere Ultimate heating cable into place on the ultimate matting.
A close-up of a person's hand wearing a red work glove, pressing down on Thermosphere ultimate yellow heating cables to place it into the ultimate matting.
Close-up of a blue Thermosphere ultimate mat with a raised grid pattern, partially covered by wet gray self levelling compound, with yellow heating cables visible along the bottom.
A close-up of a person's hand using a trowel to apply tile adhesive over a blue Thermosphere ultimate mat with yellow and black heating cables.
A blue and green striped L-shaped bath mat on a white tiled bathroom floor, positioned in front of a white freestanding bathtub and a gray floor drain, with a tile cutout showing the Thermosphere Ultimate underfloor heating in place.
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ThermoSphere Ultimate HDM-015 decoupling membrane roll — dimpled uncoupling matting for tile installation over heated and problem substrates1m² sheet of ThermoSphere Ultimate Decoupling Membrane — main packshot of the polyethylene anti-fracture matting for tile installation over heated subfloors.A bright blue Thermosphere ultimate mat shown partially unrolled from a roll on a plain white background.A person's hands peeling back a white protective film from a blue Thermosphere self adhesive ultimate matting for underfloor heating, ready to lay onto green chipboard flooring.ThermoSphere Ultimate decoupling membrane — application diagram showing tile installation build-upThermoSphere Ultimate decoupling membrane — underside fabric detail for substrate bondingA close-up of a person's hand fixing a yellow heating wire into a blue Thermsophere ultimate mat with a small black component near the top left, against a white background.A close-up of a person's hand fixing the yellow Thermosphere ultimate heating cable into place on the ultimate mattingA close-up of a hand using a grout float to place Thermosphere Ultimate heating cable into place on the ultimate matting.A close-up of a person's hand wearing a red work glove, pressing down on Thermosphere ultimate yellow heating cables to place it into the ultimate matting.Close-up of a blue Thermosphere ultimate mat with a raised grid pattern, partially covered by wet gray self levelling compound, with yellow heating cables visible along the bottom.A close-up of a person's hand using a trowel to apply tile adhesive over a blue Thermosphere ultimate mat with yellow and black heating cables.A blue and green striped L-shaped bath mat on a white tiled bathroom floor, positioned in front of a white freestanding bathtub and a gray floor drain, with a tile cutout showing the Thermosphere Ultimate underfloor heating in place.

ThermoSphere Self-Adhesive Decoupling Membrane

ThermoSphere
Size: 1 sqm Panel
Price:
£20.99

What goes with this?

Accessories and essentials for this job — add what you need.

  • ThermoSphere Ultimate Low Wattage Decoupling Membrane Heating Cable

    ThermoSphere heating cable made for the decoupling membrane

    From £59.99inc. VAT

  • ThermoSphere Waterproofing Paste 5kg (HDM-WP-01)

    ThermoSphere waterproofing paste for the decoupling membrane

    £71.99inc. VAT

  • ThermoSphere Waterproofing Tape (HDM-WT-01)

    ThermoSphere waterproofing tape for the decoupling membrane

    £29.99inc. VAT

  • ThermoSphere T-MO Thermostat

    ThermoSphere 16 A thermostat with floor sensor included — check the load suits your system

    £119.99inc. VAT

Description

ThermoSphere Self-Adhesive Decoupling Membrane is a peel-and-stick polyethylene membrane that lays directly onto a clean plywood sub-floor without the need for tile adhesive underneath, making it the fastest way to prepare a timber floor for tiling or for the ThermoSphere Ultimate heating cable.

Key Benefits

  • Self-adhesive backing bonds straight to a clean plywood sub-floor
  • Removes the need for a wet bed of adhesive under the membrane
  • Decouples tile finishes from timber movement, reducing cracking risk
  • Compatible with ThermoSphere Ultimate heating cable at 130W/m² or 195W/m²
  • Available as a 1m² panel or 15m² roll for larger areas
  • Robinson test rated for extra heavy trade use

Applications

Suited to bathroom fitters and tilers working over timber sub-floors in bathrooms, kitchens, and wetrooms, including projects with underfloor heating.

Performance & Features

The dimpled polyethylene profile decouples the tile layer from the substrate below while the self-adhesive underside speeds up installation on suitable plywood sub-floors.

Compatibility

Pairs with the ThermoSphere Ultimate heating cable range and ThermoSphere waterproofing paste and tape for a fully tanked, heated floor build-up.

Supplied by Millcot as part of our full ThermoSphere underfloor heating and floor preparation range.

Downloads

FAQs

What sub-floor does this need?
A clean, sound, dry plywood sub-floor. Check the datasheet for minimum plywood specification before fixing.

Can I still fit heating cable into this membrane?
Yes, it accepts ThermoSphere Ultimate cable at either 130W/m² or 195W/m² depending on dimple spacing used.

Which size do I need?
The 1m² panel suits small repairs or single-panel areas; the 15m² roll suits full bathroom or wetroom floors.

Do I still need tile adhesive on top?
Yes, tiles are fixed to the membrane with a flexible tile adhesive in the normal way.