Cormar Natural Berber Deluxe and Tredaire Colours Red: combined TOG for underfloor heating
The combined TOG for Cormar Natural Berber Deluxe over Tredaire Colours Red, 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 Natural Berber Deluxe (2 TOG) |
|---|---|
| Underlay | Tredaire Colours Red (1.65 TOG) |
| Published sum | 3.65 TOG |
| UHMA in-situ correction | minus 1 TOG |
| Combined in-situ TOG | 2.65 TOG |
| Standard UFH limit | 2.5 TOG |
| Heat pump target | under 1.5 TOG |
Cormar Natural Berber Deluxe is rated 2 TOG and Tredaire Colours Red is rated 1.65 TOG. Laid together the combination is what the underfloor heating has to warm through.
The published TOG figures add to 3.65, and even after the UHMA 1 TOG in-situ correction the pair sits at 2.65 TOG, 0.15 TOG over the limit. The carpet is fine; the underlay is doing the damage. Keep Cormar Natural Berber Deluxe 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.
Sources: UHMA guidance on underfloor heating with carpet and underlay (combined-TOG rule) · How to calculate a combined TOG (UHMA formula, worked) · Cormar Carpets published carpet TOG values · Interfloor / Tredaire Colours Red sponge-rubber underlay specification