Tog values and what they mean
As a rule, the total combined tog value of the floorcovering and any underlay needs to stay under the maximum figure the heating manufacturer specifies, otherwise the system cannot get enough heat through to warm the room effectively.
| Floorcovering | Typical tog range | UFH suitability |
|---|---|---|
| LVT and vinyl | Low, around 0.05-0.3 | Good, minimal resistance to heat output |
| Ceramic and stone-look LVT | Very low | Excellent, efficient heat transfer |
| Engineered wood (correct spec) | Low to moderate | Good if manufacturer approves UFH use |
| Laminate | Moderate | Usually acceptable within manufacturer limits |
| Carpet with underlay | Higher, varies with pile and underlay | Combined tog must stay under the system's stated maximum |



