TogCheck
Underlay TOG rating

Cormar Kingston Classic TOG value and underfloor heating

The published Cormar TOG value for Cormar Kingston Classic and the underlay budget it leaves over a heated floor.

1.52.5
1.1TOG
Suitable for UFH

Leaves 1.4 TOG of the combined budget for the carpet on top before the 2.5 TOG limit is reached.

PassMarginalFail
Published value
RangeCormar Kingston Classic
Constructionpolypropylene twist
TOG rating1.1 TOG
Max underlay TOG for UFH2.4 TOG

Cormar Kingston Classic is a polypropylene twist with a published TOG value of 1.1. A value twist rated 1.1 TOG, low enough to pair with most underfloor-heating underlays.

Using the UHMA rule, in-situ resistance is carpet plus underlay minus 1. To keep Cormar Kingston Classic under the 2.5 TOG limit the underlay must be no more than 2.4 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.

Underlay pairings
Cormar Kingston Classic with Duralay Technics 5combined 0.66 TOGCormar Kingston Classic with Duralay Heatflow for Carpetcombined 0.85 TOGCormar Kingston Classic with Tredaire King (Duralay King)combined 0.9 TOGCormar Kingston Classic with Duralay Durafit 650combined 1.2 TOGCormar Kingston Classic with Tredaire Softwalkcombined 2.79 TOGCormar Kingston Classic with Tredaire Dreamwalkcombined 3.23 TOG

Sources: Cormar Carpets published carpet TOG values · UHMA guidance on underfloor heating with carpet and underlay (combined-TOG rule)