TogCheck
Underlay TOG rating

Cormar Primo Textures Weave TOG value and underfloor heating

The published Cormar TOG value for Cormar Primo Textures Weave and the underlay budget it leaves over a heated floor.

1.52.5
0.9TOG
Suitable for UFH

Leaves 1.6 TOG of the combined budget for the carpet on top before the 2.5 TOG limit is reached.

PassMarginalFail
Published value
RangeCormar Primo Textures Weave
Constructionflat-weave polypropylene loop
TOG rating0.9 TOG
Max underlay TOG for UFH2.6 TOG

Cormar Primo Textures Weave is a flat-weave polypropylene loop with a published TOG value of 0.9. At 0.9 TOG this is the lowest-resistance Cormar carpet listed. It leaves the widest underlay budget of any range over a heated floor.

Using the UHMA rule, in-situ resistance is carpet plus underlay minus 1. To keep Cormar Primo Textures Weave under the 2.5 TOG limit the underlay must be no more than 2.6 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 Primo Textures Weave with Duralay Technics 5combined 0.46 TOGCormar Primo Textures Weave with Duralay Heatflow for Carpetcombined 0.65 TOGCormar Primo Textures Weave with Tredaire King (Duralay King)combined 0.7 TOGCormar Primo Textures Weave with Duralay Durafit 650combined 1 TOGCormar Primo Textures Weave with Tredaire Softwalkcombined 2.59 TOGCormar Primo Textures Weave with Tredaire Dreamwalkcombined 3.03 TOG

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