Brockway Orion Twist Major has a published TOG value of 2.05. The underlay TOG it can take and stay under the 2.5 TOG combined limit for underfloor heating.
Updated 05 September 2026.
Brockway Orion Twist Major TOG value and underfloor heating
The published Cormar TOG value for Brockway Orion Twist Major and the underlay budget it leaves over a heated floor.
Leaves 0.45 TOG of the combined budget for the carpet on top before the 2.5 TOG limit is reached.
| Range | Brockway Orion Twist Major |
|---|---|
| Construction | 80% wool wool-blend twist (heavyweight) |
| TOG rating | 2.05 TOG |
| Max underlay TOG for UFH | 1.45 TOG |
Brockway Orion Twist Major is a 80% wool wool-blend twist (heavyweight) with a published TOG value of 2.05. Orion Twist Major is the heavyweight version of Orion Twist rated 2.05 TOG. Its deep pile is already near the combined limit, so almost no underlay pairing passes over underfloor heating.
Using the UHMA rule, in-situ resistance is carpet plus underlay minus 1. To keep Brockway Orion Twist Major under the 2.5 TOG limit the underlay must be no more than 1.45 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.
Questions and answers
What is the range of the Brockway Orion Twist Major TOG value and underfloor heating?
Brockway Orion Twist Major
What is the construction of the Brockway Orion Twist Major TOG value and underfloor heating?
80% wool wool-blend twist (heavyweight)
What is the tog rating of the Brockway Orion Twist Major TOG value and underfloor heating?
2.05 TOG
What is the max underlay tog for ufh of the Brockway Orion Twist Major TOG value and underfloor heating?
1.45 TOG