TogCheck
Combined TOG result

Cormar Trilogy Collins and Duralay Heatflow for Carpet: combined TOG for underfloor heating

The combined TOG for Cormar Trilogy Collins over Duralay Heatflow for Carpet, worked against the UHMA underfloor heating rule.

1.52.5
1.05TOG in situ
Pass · limit 2.5
Published TOG stack (carpet + underlay)
carpet 1.3
underlay 0.75
limit

Combined against the UHMA 2.5 TOG underfloor-heating limit. Under 1.5 also suits a low-temperature heat pump.

Carpet TOGUnderlay TOGPassMarginalFail
Combined in-situ TOG is 1.05, under the 2.5 TOG limit, so Cormar Trilogy Collins with Duralay Heatflow for Carpet is suitable for a standard underfloor heating system. It is also under 1.5 TOG, so it suits a low-temperature heat pump run.
The combined-TOG calculation
CarpetCormar Trilogy Collins (1.3 TOG)
UnderlayDuralay Heatflow for Carpet (0.75 TOG)
Published sum2.05 TOG
UHMA in-situ correctionminus 1 TOG
Combined in-situ TOG1.05 TOG
Standard UFH limit2.5 TOG
Heat pump targetunder 1.5 TOG

Cormar Trilogy Collins is rated 1.3 TOG and Duralay Heatflow for Carpet is rated 0.75 TOG. Laid together the combination is what the underfloor heating has to warm through.

The published TOG figures add to 2.05. The UHMA rule subtracts 1 TOG because tests showed real in-situ resistance runs about a TOG below the paper sum, giving 1.05 TOG. That clears both the standard limit and the tighter heat-pump target.

Related checks
Cormar Trilogy Collins TOG value1.3 TOGDuralay Heatflow for Carpet TOG rating0.75 TOGCormar Pimlico with Duralay Heatflow for Carpet0.75 TOG, passCormar Primo Textures Ribbed with Duralay Heatflow for Carpet0.75 TOG, passCormar Primo Textures Weave with Duralay Heatflow for Carpet0.65 TOG, passCormar Apollo Plus with Duralay Heatflow for Carpet0.85 TOG, pass

Sources: UHMA guidance on underfloor heating with carpet and underlay (combined-TOG rule) · How to calculate a combined TOG (UHMA formula, worked) · Cormar Carpets published carpet TOG values · Interfloor / Duralay Heatflow for Carpet datasheet