Best Flooring for Underfloor Heating in Wiltshire Homes
Underfloor heating is increasingly popular in Wiltshire new builds and renovation projects. But not all flooring types are compatible — and choosing the wrong product can damage both the floor and the heating system. This guide covers everything you need to know.
How Underfloor Heating Affects Flooring Choice
Underfloor heating (UFH) works by warming the floor surface from below, which then radiates heat into the room. For this to work efficiently, the flooring must conduct heat effectively — thick, insulating materials like deep-pile carpet and certain types of underlay will reduce the system's efficiency.
The key specification for UFH compatibility is the total thermal resistance (tog rating) of the floor construction — flooring plus underlay. Most UFH manufacturers recommend a maximum combined tog rating of 2.5. Exceeding this will reduce efficiency and may cause the system to overheat.
LVT and UFH: The Best Combination
LVT is the most popular flooring choice for rooms with underfloor heating in Wiltshire, and it is easy to see why. It conducts heat efficiently, is dimensionally stable (it does not expand and contract significantly with temperature changes), and is available in a huge range of styles.
When fitting LVT over UFH, use a thin, UFH-compatible underlay with a tog rating of 0.5 or less. Many quality LVT products are suitable for direct bonding to the screed without underlay, which maximises heat transfer efficiency.
Carpet and UFH: It Can Work
Carpet over underfloor heating is possible, but requires careful product selection. The combined tog rating of carpet and underlay must not exceed 2.5. This means using a thin, UFH-specific underlay (typically 6mm or less) and a carpet with a low tog rating — most twist pile carpets in the 30–40oz range are suitable.
Avoid thick, deep-pile carpets and standard foam underlays over UFH — these will insulate the floor too effectively and prevent the heat from reaching the room. We always check the tog ratings of our recommended products for UFH installations.
Engineered Wood and UFH
Engineered wood is compatible with underfloor heating, provided the temperature is managed carefully. Most engineered wood manufacturers specify a maximum floor surface temperature of 27°C — exceeding this can cause the boards to dry out, shrink, and crack.
A floating installation (click-lock) is generally preferred over glue-down for engineered wood over UFH, as it allows for minor movement with temperature changes. Always follow the manufacturer's specific UFH guidelines for the product you choose.
Frequently Asked Questions
Can you fit carpet over underfloor heating?
Yes, carpet can be fitted over underfloor heating, but the combined tog rating of carpet and underlay must not exceed 2.5. Use a thin, UFH-specific underlay and a carpet with a low tog rating. Avoid deep-pile carpets and standard foam underlays over UFH systems.
Is LVT good for underfloor heating?
LVT is one of the best flooring choices for underfloor heating. It conducts heat efficiently, is dimensionally stable, and is available with UFH-compatible underlays. Many LVT products can be bonded directly to the screed without underlay for maximum heat transfer.
What flooring should I avoid with underfloor heating?
Avoid thick, deep-pile carpets, solid wood flooring, and standard foam underlays over underfloor heating. These materials insulate the floor too effectively and will reduce the efficiency of your heating system. Always check the tog rating of any flooring and underlay combination.
Do you install flooring over underfloor heating in Wiltshire?
Yes. Wiltshire Carpet Warehouse installs all flooring types over underfloor heating across Chippenham, Trowbridge, Bath, Bristol and surrounding areas. We always check tog ratings and follow manufacturer guidelines for UFH installations.