Cormar Sensation Original TOG value and underfloor heating
The published Cormar TOG value for Cormar Sensation Original and the underlay budget it leaves over a heated floor.
Leaves 0.8 TOG of the combined budget for the carpet on top before the 2.5 TOG limit is reached.
| Range | Cormar Sensation Original |
|---|---|
| Construction | polypropylene saxony |
| TOG rating | 1.7 TOG |
| Max underlay TOG for UFH | 1.8 TOG |
Cormar Sensation Original is a polypropylene saxony with a published TOG value of 1.7. A soft saxony rated 1.7 TOG, which needs one of the lowest-TOG underlays to work over a heated floor.
Using the UHMA rule, in-situ resistance is carpet plus underlay minus 1. To keep Cormar Sensation Original under the 2.5 TOG limit the underlay must be no more than 1.8 TOG.
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.
Sources: Cormar Carpets published carpet TOG values · UHMA guidance on underfloor heating with carpet and underlay (combined-TOG rule)