Cloud 9 Nimbus is rated 1.9 TOG at 7 mm. Whether it works over underfloor heating and which carpets it pairs with under the 2.5 TOG limit.

Updated 05 September 2026.

Underlay TOG rating

Cloud 9 Nimbus TOG rating and underfloor heating

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

1.52.5
1.9TOG
Too warm for UFH

Leaves 0.6 TOG of the combined budget for the carpet on top before the 2.5 TOG limit is reached.

PassMarginalFail
Cloud 9 Nimbus is rated 1.9 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
ManufacturerBall & Young
TOG rating1.9 TOG
Thickness7 mm
DensityPU foam
Sound33 dB impact reduction
Underfloor heatingNot suitable

Nimbus is Ball & Young's 7 mm PU foam domestic underlay rated 1.9 TOG. That resistance alone is most of the combined budget, so it is a warm-feel underlay for rooms without a heated floor.

Because Cloud 9 Nimbus is already 1.9 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 Nimbuscombined 1.9 TOGCormar Primo Textures Ribbed with Cloud 9 Nimbuscombined 1.9 TOGCormar Primo Textures Weave with Cloud 9 Nimbuscombined 1.8 TOGCormar Apollo Plus with Cloud 9 Nimbuscombined 2 TOGCormar Apollo Elite with Cloud 9 Nimbuscombined 2.4 TOGCormar Fairisle with Cloud 9 Nimbuscombined 2.4 TOG

Questions and answers

What is the manufacturer of the Cloud 9 Nimbus TOG rating and underfloor heating?

Ball & Young

What is the tog rating of the Cloud 9 Nimbus TOG rating and underfloor heating?

1.9 TOG

What is the thickness of the Cloud 9 Nimbus TOG rating and underfloor heating?

7 mm

What is the density of the Cloud 9 Nimbus TOG rating and underfloor heating?

PU foam