Brockway Padstow (1.54 TOG) with Tredaire King (Duralay King) (0.8 TOG) gives a combined 1.34 in-situ TOG. Whether that passes the 2.5 TOG underfloor heating limit and what to do.
Updated 05 September 2026.
Brockway Padstow and Tredaire King (Duralay King): combined TOG for underfloor heating
The combined TOG for Brockway Padstow over Tredaire King (Duralay King), worked against the UHMA underfloor heating rule.
Combined against the UHMA 2.5 TOG underfloor-heating limit. Under 1.5 also suits a low-temperature heat pump.
| Carpet | Brockway Padstow (1.54 TOG) |
|---|---|
| Underlay | Tredaire King (Duralay King) (0.8 TOG) |
| Published sum | 2.34 TOG |
| UHMA in-situ correction | minus 1 TOG |
| Combined in-situ TOG | 1.34 TOG |
| Standard UFH limit | 2.5 TOG |
| Heat pump target | under 1.5 TOG |
Brockway Padstow is rated 1.54 TOG and Tredaire King (Duralay King) is rated 0.8 TOG. Laid together the combination is what the underfloor heating has to warm through.
The published TOG figures add to 2.34. The UHMA rule subtracts 1 TOG because tests showed real in-situ resistance runs about a TOG below the paper sum, giving 1.34 TOG. That clears both the standard limit and the tighter heat-pump target.
Questions and answers
Brockway Padstow and Tredaire King (Duralay King): combined TOG for underfloor heating?
Combined in-situ TOG is 1.34, under the 2.5 TOG limit, so Brockway Padstow with Tredaire King (Duralay King) is suitable for a standard underfloor heating system. It is also under 1.5 TOG, so it suits a low-temperature heat pump run.