UK Cold Floors Buying Guide
If your carpeted room feels cold from below, a higher-tog underlay can improve comfort by slowing heat transfer through the floor. But the best choice depends on whether you want maximum insulation, better durability, quieter rooms or compatibility with underfloor heating.
Quick answer: Tredaire Dreamwalk is our best overall pick for a cold carpeted floor because its current specification combines a high 3.13 tog rating with 11mm thickness and strong sound insulation. Cloud 9 Cumulus is a close premium alternative at 3.1 tog. If you have underfloor heating, do the opposite: use a low-tog product such as Wilsons ThermalStream so the heat can pass through the carpet system.
Best carpet underlay for cold floors UK: quick picks
| Pick | Tog | Thickness | Best for |
|---|---|---|---|
| Tredaire Dreamwalk | 3.13 | 11mm | Best overall thermal insulation |
| Cloud 9 Cumulus | 3.1 | 11mm | Premium comfort + insulation |
| Tredaire Sensation | 2.89 | 11mm | Dense, durable domestic use |
| Cloud 9 Contract | 2.0 | 8mm | High-traffic rooms and firmer feel |
| Wilsons ThermalStream | 0.87 | 10mm | Underfloor heating |
Specifications were checked in September 2026 against current manufacturer information. Tog measures thermal resistance: higher is more insulating, while lower is usually better when you need heat to pass up from underfloor heating.
How we chose these carpet underlays
AurumPick has not laboratory-tested these products. We compared manufacturer specifications for thermal resistance, thickness, density, sound reduction, installation type and intended use. We also checked whether the product is designed to insulate the room from a cold floor or to allow heat through from underfloor heating, because those are opposite goals.
We did not rank underlays by softness alone. A very thick or soft product is not automatically more thermally efficient, and the highest-tog product is not suitable for every heating system.
Before buying underlay, confirm that carpet and underlay are actually the right fix. If the floor has major draughts, damp or no insulation beneath a suspended timber floor, start with How to Stop Cold Floors in the UK.
1. Tredaire Dreamwalk — best overall for a cold carpeted floor
Best for: bedrooms and living rooms where maximum thermal resistance and comfort matter.
Interfloor currently specifies Dreamwalk at 3.13 tog, 11mm thick and 110kg/m³ density. It also carries a 44dB sound-insulation rating and uses 100% recycled foam.
- 3.13 tog thermal resistance.
- 11mm thickness.
- 15.07m² roll area.
- 44dB impact sound insulation.
- High-density PU foam.
- Stretch-fit installation.
Trade-off: its high thermal resistance makes it a poor choice where you rely on underfloor heating to transfer heat through the carpet.
AurumPick verdict: the strongest all-round choice here when the priority is making a conventionally heated carpeted room feel less cold underfoot.
2. Cloud 9 Cumulus — best premium alternative
Best for: buyers who want very high thermal resistance with a soft luxury feel.
Ball & Young specifies Cloud 9 Cumulus at 3.1 tog, 11mm thickness and 43dB impact sound reduction. It is rated for luxury use and carries a lifetime guarantee for the initial carpet installation when used in recommended areas.
- 3.1 tog thermal resistance.
- 11mm thickness.
- 15m²-class roll coverage.
- 43dB sound insulation.
- Luxury-use classification.
- Manufactured in the UK.
Trade-off: like Dreamwalk, the high tog makes it unsuitable for most underfloor-heating applications unless the complete carpet system falls within the heating manufacturer’s limits.
AurumPick verdict: a close alternative to Dreamwalk when you prioritise warmth and a more luxurious underfoot feel.
3. Tredaire Sensation — best dense thermal option
Best for: homes that want strong insulation but also value density and durability.
Tredaire Sensation is specified at 2.89 tog, 11mm thickness and 145kg/m³ density, with a 43dB sound-insulation rating. It is denser than Dreamwalk while still offering high thermal resistance.
- 2.89 tog.
- 11mm thickness.
- 145kg/m³ density.
- 43dB sound insulation.
- 100% recycled foam.
- Stretch-fit installation.
Trade-off: slightly less insulating than Dreamwalk and still too thermally resistant for many underfloor-heating systems.
AurumPick verdict: the best balance here if you want a dense underlay with strong thermal and acoustic performance rather than chasing the absolute highest tog number.
4. Cloud 9 Contract 8mm — best for high-traffic rooms
Best for: hallways, busy living areas and rooms where durability matters more than maximum softness.
Cloud 9 Contract uses an 8mm PU construction and is rated at 2.0 tog. Ball & Young positions it for heavy contract and domestic use, while current UK retailers also list it as suitable for stretch-fit and double-stick installations.
- 2.0 tog.
- 8mm thickness.
- Heavy contract/domestic classification.
- 35–37dB-class impact sound performance.
- Stretch-fit or double-stick installation.
- Firmer feel than the luxury 11mm options.
Trade-off: it gives less thermal resistance than Dreamwalk, Cumulus or Sensation, so choose it for durability rather than maximum insulation.
AurumPick verdict: the practical choice for a cold but heavily used carpeted room where a softer high-tog underlay is not the only priority.
5. Wilsons ThermalStream — best if you have underfloor heating
Best for: carpet over electric or hydronic underfloor heating where you need heat transfer, not extra insulation from below.
ThermalStream is the deliberate exception in this list. Wilsons specifies it at only 0.87 tog, 10mm thickness and 15m² coverage, specifically for underfloor-heating systems.
- 0.87 tog.
- 10mm thickness.
- 15m² coverage.
- Designed for electric and water-based UFH.
- 46dB impact sound reduction.
- Flame-retardant foam construction.
Trade-off: it is not the product to choose if your aim is to insulate a cold floor from below without underfloor heating. Its lower thermal resistance is intentional so useful heat can pass through.
AurumPick verdict: choose a low-tog specialist product like this when underfloor heating is the heat source. A high-tog thermal underlay can work against the system.
What does tog mean for carpet underlay?
Tog is a measure of thermal resistance. A higher tog resists heat flow more strongly, which can help when you want to reduce heat loss through a cold floor. A lower tog lets heat pass through more easily, which is what you want above underfloor heating.
| Situation | What to prioritise | Why |
|---|---|---|
| Cold suspended or solid floor, conventional heating | Higher tog | Reduces downward heat transfer |
| Underfloor heating | Lower tog | Allows heat to reach the room |
| High-traffic room | Density + durability | Prevents early compression |
| Bedroom / quiet room | Thermal + acoustic comfort | Warmth and noise reduction both matter |
Always consider the combined thermal resistance of the carpet and underlay where underfloor heating is installed. Follow the UFH manufacturer’s maximum specification rather than relying on the underlay tog alone.
How to choose the right underlay for a cold floor
Fix draughts before hiding them
If air is moving through floorboard gaps, skirting edges or service penetrations, underlay may make the room feel better but will not repair the air leakage underneath. Deal with the source where practical.
Check the carpet manufacturer’s limits
Very thick underlay can affect some carpet warranties, door clearances and gripper setup. Match the underlay to the carpet type and fitting method.
Do not use high tog over underfloor heating without checking
The highest-tog underlay in a shop is not automatically the best product. Above UFH, excessive thermal resistance can slow heat transfer and make the heating system work harder.
Prioritise density in busy rooms
Stairs, hallways and heavily used living rooms place more mechanical stress on underlay. A slightly lower-tog but denser product can be the better long-term choice.
Our recommendations by use case
- Maximum thermal insulation: Tredaire Dreamwalk.
- Luxury high-tog alternative: Cloud 9 Cumulus.
- Dense thermal option: Tredaire Sensation.
- High-traffic room: Cloud 9 Contract 8mm.
- Underfloor heating: Wilsons ThermalStream.
If you are not sure whether underlay is enough, start with How to Stop Cold Floors in the UK. For the wider fabric-first approach, visit the Insulation & Heat Loss UK hub.
FAQs
What is the best tog underlay for a cold floor?
For a conventionally heated carpeted room, a higher tog generally provides more thermal resistance. Products around 2.9–3.1+ tog are among the stronger insulating carpet underlays currently available in the UK.
Is 3 tog underlay good?
Yes for thermal insulation under conventional heating. It is not automatically suitable over underfloor heating because it can restrict heat transfer.
Does thick underlay make a room warmer?
Thickness can contribute to comfort, but tog is the more useful measure of thermal resistance. Two underlays of similar thickness can have different tog ratings.
Can carpet underlay replace floor insulation?
No. It can improve surface comfort and reduce some heat transfer, but an uninsulated suspended ground floor may still benefit from proper insulation between the joists.
What underlay should I use with underfloor heating?
Use a low-tog product specifically designed for UFH and keep the combined carpet-plus-underlay resistance within the heating manufacturer’s limit.
Is Cloud 9 Cumulus suitable for underfloor heating?
Its 3.1 tog rating makes it a high-insulation product rather than a low-resistance UFH underlay. Use a dedicated low-tog product if underfloor heating is your heat source unless your system manufacturer explicitly approves the full floor build-up.
Sources and product information
- Interfloor — Tredaire Dreamwalk
- Ball & Young — Cloud 9 Cumulus
- Interfloor — Tredaire Sensation
- Ball & Young — Cloud 9 range
- Wilsons Underlays — ThermalStream
AurumPick may add affiliate links where appropriate. Product inclusion is based on manufacturer specifications and fit for the use case, not commission rate.