Underlay TOG rating

Duralay Technics 5 TOG rating and underfloor heating

The published TOG and datasheet figures for Duralay Technics 5, and what it means over a heated floor.

0.56TOG

Suitable for UFH

Leaves 1.94 TOG of the combined budget for the carpet on top before the 2.5 TOG limit is reached.

PassMarginalFail

Duralay Technics 5 is rated 0.56 TOG and is suitable for underfloor heating. It leaves 2.94 TOG of the combined budget for the carpet on top before the 2.5 TOG limit is reached.

Published datasheet

Manufacturer	Interfloor (Duralay)
TOG rating	0.56 TOG
Thickness	5 mm
Density	542 kg/m3
Sound	sponge rubber, twin scrim
Underfloor heating	Suitable

At 0.56 TOG this is one of the lowest-resistance carpet underlays on the market, built as a contract twin-scrim sponge on the Textron backing. It leaves almost the whole combined-TOG budget for the carpet above it.

Against the UHMA combined-TOG rule, in-situ resistance is the carpet TOG plus the underlay TOG minus 1. With this underlay at 0.56 TOG, a carpet up to 2.94 TOG keeps the pair under the 2.5 TOG limit.

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.

Pairings and alternatives

Cormar Pimlico with Duralay Technics 5combined 0.56 TOG Cormar Primo Textures Ribbed with Duralay Technics 5combined 0.56 TOG Cormar Primo Textures Weave with Duralay Technics 5combined 0.46 TOG Cormar Apollo Plus with Duralay Technics 5combined 0.66 TOG Cormar Apollo Elite with Duralay Technics 5combined 1.06 TOG Cormar Fairisle with Duralay Technics 5combined 1.06 TOG

Sources: Interfloor / Duralay Technics 5 underlay datasheet · UHMA guidance on underfloor heating with carpet and underlay (combined-TOG rule)