Cormar Kingston Elite (1.2 TOG) with Cloud 9 Caviar & Crystal 11 (2.7 TOG) gives a combined 2.9 in-situ TOG. Whether that passes the 2.5 TOG underfloor heating limit and what to do.
Updated 05 September 2026.
Cormar Kingston Elite and Cloud 9 Caviar & Crystal 11: combined TOG for underfloor heating
The combined TOG for Cormar Kingston Elite over Cloud 9 Caviar & Crystal 11, worked against the UHMA underfloor heating rule.
Combined against the UHMA 2.5 TOG underfloor-heating limit. Under 1.5 also suits a low-temperature heat pump.
| Carpet | Cormar Kingston Elite (1.2 TOG) |
|---|---|
| Underlay | Cloud 9 Caviar & Crystal 11 (2.7 TOG) |
| Published sum | 3.9 TOG |
| UHMA in-situ correction | minus 1 TOG |
| Combined in-situ TOG | 2.9 TOG |
| Standard UFH limit | 2.5 TOG |
| Heat pump target | under 1.5 TOG |
Cormar Kingston Elite is rated 1.2 TOG and Cloud 9 Caviar & Crystal 11 is rated 2.7 TOG. Laid together the combination is what the underfloor heating has to warm through.
The published TOG figures add to 3.9, and even after the UHMA 1 TOG in-situ correction the pair sits at 2.9 TOG, 0.4 TOG over the limit. The carpet is fine; the underlay is doing the damage. Keep Cormar Kingston Elite and drop to a low-TOG underlay such as Duralay Heatflow for Carpet (0.75 TOG) or Duralay Technics 5 (0.56 TOG), which brings the combined figure back into range.
Questions and answers
Cormar Kingston Elite and Cloud 9 Caviar & Crystal 11: combined TOG for underfloor heating?
Combined in-situ TOG is 2.9, above the 2.5 TOG limit, so Cormar Kingston Elite with Cloud 9 Caviar & Crystal 11 is not suitable for underfloor heating. Keep the carpet and switch to a low-TOG underlay.