Underlay TOG rating

Cormar Malabar Two Fold TOG value and underfloor heating

The published Cormar TOG value for Cormar Malabar Two Fold and the underlay budget it leaves over a heated floor.

1.2TOG

Suitable for UFH

Leaves 1.3 TOG of the combined budget for the carpet on top before the 2.5 TOG limit is reached.

PassMarginalFail

Published value

Range	Cormar Malabar Two Fold
Construction	wool twist
TOG rating	1.2 TOG
Max underlay TOG for UFH	2.3 TOG

Cormar Malabar Two Fold is a wool twist with a published TOG value of 1.2. A two-fold wool twist at 1.2 TOG, one of the warmer-feeling wools that still keeps the combined figure in range with the right underlay.

Using the UHMA rule, in-situ resistance is carpet plus underlay minus 1. To keep Cormar Malabar Two Fold under the 2.5 TOG limit the underlay must be no more than 2.3 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 Malabar Two Fold with Duralay Technics 5combined 0.76 TOG Cormar Malabar Two Fold with Duralay Heatflow for Carpetcombined 0.95 TOG Cormar Malabar Two Fold with Tredaire King (Duralay King)combined 1 TOG Cormar Malabar Two Fold with Duralay Durafit 650combined 1.3 TOG Cormar Malabar Two Fold with Tredaire Softwalkcombined 2.89 TOG Cormar Malabar Two Fold with Tredaire Dreamwalkcombined 3.33 TOG

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