Underlay TOG rating

Duralay Heatflow for Carpet TOG rating and underfloor heating

The published TOG and datasheet figures for Duralay Heatflow for Carpet, and what it means over a heated floor.

0.75TOG

Suitable for UFH

Leaves 1.75 TOG of the combined budget for the carpet on top before the 2.5 TOG limit is reached.

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Duralay Heatflow for Carpet is rated 0.75 TOG and is suitable for underfloor heating. It leaves 2.75 TOG of the combined budget for the carpet on top before the 2.5 TOG limit is reached.

Published datasheet

Manufacturer	Interfloor (Duralay)
TOG rating	0.75 TOG
Thickness	6.1 mm
Density	495 kg/m3
Sound	31 dB impact reduction
Underfloor heating	Suitable

Heatflow is a sponge-rubber underlay engineered specifically to conduct heat rather than trap it, which is why it carries a deliberately low 0.75 TOG. It is Interfloor's carpet answer for underfloor heating.

Against the UHMA combined-TOG rule, in-situ resistance is the carpet TOG plus the underlay TOG minus 1. With this underlay at 0.75 TOG, a carpet up to 2.75 TOG keeps the pair under the 2.5 TOG limit.

TOG measures thermal resistance, so a low number means heat passes through easily. For a floor covering over underfloor heating that is what you want. A comfort underlay chosen for warmth underfoot does the opposite job and is the usual reason a heated floor underperforms after a carpet goes down.

Pairings and alternatives

Cormar Pimlico with Duralay Heatflow for Carpetcombined 0.75 TOG Cormar Primo Textures Ribbed with Duralay Heatflow for Carpetcombined 0.75 TOG Cormar Primo Textures Weave with Duralay Heatflow for Carpetcombined 0.65 TOG Cormar Apollo Plus with Duralay Heatflow for Carpetcombined 0.85 TOG Cormar Apollo Elite with Duralay Heatflow for Carpetcombined 1.25 TOG Cormar Fairisle with Duralay Heatflow for Carpetcombined 1.25 TOG

Sources: Interfloor / Duralay Heatflow for Carpet datasheet · UHMA guidance on underfloor heating with carpet and underlay (combined-TOG rule)