Underlay TOG rating

Tredaire Softwalk TOG rating and underfloor heating

The published TOG and datasheet figures for Tredaire Softwalk, and what it means over a heated floor.

2.69TOG

Too warm for UFH

Already 0.19 TOG over the 2.5 TOG limit on its own, before any carpet is added.

PassMarginalFail

Tredaire Softwalk is rated 2.69 TOG. That alone is above the 2.5 TOG combined limit for underfloor heating, so it is not suitable over a heated floor with any carpet.

Published datasheet

Manufacturer	Interfloor (Tredaire)
TOG rating	2.69 TOG
Thickness	9 mm
Density	110 kg/m3
Sound	41 dB impact reduction
Underfloor heating	Not suitable

Softwalk is a 9 mm PU foam comfort underlay from the Seventh Heaven range. Its 2.69 TOG alone already exceeds the whole combined limit for underfloor heating, so it is a warm-feel underlay for rooms without a heated floor.

Because Tredaire Softwalk is already 2.69 TOG before any carpet is added, no carpet brings the pair back under the 2.5 TOG limit. Over underfloor heating, swap it for a low-TOG underlay instead.

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 Tredaire Softwalkcombined 2.69 TOG Cormar Primo Textures Ribbed with Tredaire Softwalkcombined 2.69 TOG Cormar Primo Textures Weave with Tredaire Softwalkcombined 2.59 TOG Cormar Apollo Plus with Tredaire Softwalkcombined 2.79 TOG Cormar Apollo Elite with Tredaire Softwalkcombined 3.19 TOG Cormar Fairisle with Tredaire Softwalkcombined 3.19 TOG

Sources: Interfloor / Tredaire Softwalk underlay datasheet · UHMA guidance on underfloor heating with carpet and underlay (combined-TOG rule)