Cloud 9 Caviar & Crystal 9 is rated 2.3 TOG at 9 mm. Whether it works over underfloor heating and which carpets it pairs with under the 2.5 TOG limit.
Updated 05 September 2026.
Cloud 9 Caviar & Crystal 9 TOG rating and underfloor heating
The published TOG and datasheet figures for Cloud 9 Caviar & Crystal 9, and what it means over a heated floor.
Leaves 0.2 TOG of the combined budget for the carpet on top before the 2.5 TOG limit is reached.
| Manufacturer | Ball & Young |
|---|---|
| TOG rating | 2.3 TOG |
| Thickness | 9 mm |
| Density | PU foam |
| Sound | 39 dB impact reduction |
| Underfloor heating | Not suitable |
Caviar & Crystal 9 is a 9 mm premium PU foam underlay rated 2.3 TOG. Built for a plush, quiet feel, its resistance is above the whole combined limit, so it insulates against a heated floor rather than passing heat up.
Because Cloud 9 Caviar & Crystal 9 is already 2.3 TOG before any carpet is added, no carpet brings the pair back under the 2.5 TOG limit. Over underfloor heating, swap it for a low-TOG underlay instead.
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 manufacturer of the Cloud 9 Caviar & Crystal 9 TOG rating and underfloor heating?
Ball & Young
What is the tog rating of the Cloud 9 Caviar & Crystal 9 TOG rating and underfloor heating?
2.3 TOG
What is the thickness of the Cloud 9 Caviar & Crystal 9 TOG rating and underfloor heating?
9 mm
What is the density of the Cloud 9 Caviar & Crystal 9 TOG rating and underfloor heating?
PU foam