Underlay TOG rating

Tredaire Dreamwalk TOG rating and underfloor heating

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

3.13TOG

Too warm for UFH

Already 0.63 TOG over the 2.5 TOG limit on its own, before any carpet is added.

PassMarginalFail

Tredaire Dreamwalk is rated 3.13 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	3.13 TOG
Thickness	11 mm
Density	110 kg/m3
Sound	44 dB impact reduction
Underfloor heating	Not suitable

Dreamwalk is the thickest of the Seventh Heaven PU underlays at 11 mm, and its 3.13 TOG is the highest here. It is chosen for luxury feel and quiet in unheated rooms, and it will smother an underfloor heating system.

Because Tredaire Dreamwalk is already 3.13 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 Dreamwalkcombined 3.13 TOG Cormar Primo Textures Ribbed with Tredaire Dreamwalkcombined 3.13 TOG Cormar Primo Textures Weave with Tredaire Dreamwalkcombined 3.03 TOG Cormar Apollo Plus with Tredaire Dreamwalkcombined 3.23 TOG Cormar Apollo Elite with Tredaire Dreamwalkcombined 3.63 TOG Cormar Fairisle with Tredaire Dreamwalkcombined 3.63 TOG

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