Cloud 9 Radiance TOG rating and underfloor heating
The published TOG and datasheet figures for Cloud 9 Radiance, and what it means over a heated floor.
Leaves 1.2 TOG of the combined budget for the carpet on top before the 2.5 TOG limit is reached.
| Manufacturer | Ball & Young |
|---|---|
| TOG rating | 1.3 TOG |
| Thickness | 6 mm |
| Density | 196 kg/m3 |
| Sound | 30 dB impact reduction |
| Underfloor heating | Suitable |
Radiance is Ball & Young's dedicated underfloor-heating carpet underlay, a 6 mm PU rebond rated 1.3 TOG. It sits at the Cormar-recommended 1.3 TOG ceiling for underlay over a heated floor, so it pairs safely with lower-TOG carpets rather than the plushest ranges.
Against the UHMA combined-TOG rule, in-situ resistance is the carpet TOG plus the underlay TOG minus 1. With this underlay at 1.3 TOG, a carpet up to 2.2 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.
Sources: Ball & Young Cloud 9 Radiance underlay specification (6 mm, 1.3 TOG, underfloor-heating rated) · UHMA guidance on underfloor heating with carpet and underlay (combined-TOG rule)