Underlay TOG rating

Cloud 9 Contract TOG rating and underfloor heating

The published TOG and datasheet figures for Cloud 9 Contract, and what it means over a heated floor.

2.1TOG

Too warm for UFH

Leaves 0.4 TOG of the combined budget for the carpet on top before the 2.5 TOG limit is reached.

PassMarginalFail

Cloud 9 Contract is rated 2.1 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	Ball & Young
TOG rating	2.1 TOG
Thickness	8 mm
Density	PU foam
Sound	35 dB impact reduction
Underfloor heating	Not suitable

Cloud 9 Contract is an 8 mm PU foam underlay rated 2.1 TOG. That resistance alone is close to the whole combined limit, so it is a hard-wearing choice for unheated rooms rather than over underfloor heating.

Because Cloud 9 Contract is already 2.1 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 Cloud 9 Contractcombined 2.1 TOG Cormar Primo Textures Ribbed with Cloud 9 Contractcombined 2.1 TOG Cormar Primo Textures Weave with Cloud 9 Contractcombined 2 TOG Cormar Apollo Plus with Cloud 9 Contractcombined 2.2 TOG Cormar Apollo Elite with Cloud 9 Contractcombined 2.6 TOG Cormar Fairisle with Cloud 9 Contractcombined 2.6 TOG

Sources: Ball & Young Cloud 9 Contract underlay specification · UHMA guidance on underfloor heating with carpet and underlay (combined-TOG rule)