TogCheck
Underlay TOG rating

Cormar Silken Serenity TOG value and underfloor heating

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

1.52.5
1.5TOG
Suitable for UFH

Leaves 1 TOG of the combined budget for the carpet on top before the 2.5 TOG limit is reached.

PassMarginalFail
Published value
RangeCormar Silken Serenity
Constructionpolyester saxony
TOG rating1.5 TOG
Max underlay TOG for UFH2 TOG

Cormar Silken Serenity is a polyester saxony with a published TOG value of 1.5. A silky polyester saxony rated 1.5 TOG, in range for underfloor heating with a low-TOG underlay.

Using the UHMA rule, in-situ resistance is carpet plus underlay minus 1. To keep Cormar Silken Serenity under the 2.5 TOG limit the underlay must be no more than 2 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 Silken Serenity with Duralay Technics 5combined 1.06 TOGCormar Silken Serenity with Duralay Heatflow for Carpetcombined 1.25 TOGCormar Silken Serenity with Tredaire King (Duralay King)combined 1.3 TOGCormar Silken Serenity with Duralay Durafit 650combined 1.6 TOGCormar Silken Serenity with Tredaire Softwalkcombined 3.19 TOGCormar Silken Serenity with Tredaire Dreamwalkcombined 3.63 TOG

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