Wood Flooring for Underfloor Heating

Wood and underfloor heating work well together, as long as the floor is the right construction, the right thickness and fixed the right way. This guide covers what we specify, and why.

Order Free Samples →Browse Engineered Oak

The right construction

Engineered oak is the standard choice over underfloor heating. Solid wood is the exception.

Engineered

Stable over heat

A sawn oak layer bonded to a cross-laid birch ply core. The core resists the shrinking and swelling that heat cycles cause, so the floor stays flat and the joints stay tight.

Solid

Usually avoided

Solid boards move far more as the heating dries and warms them. Some narrow, quarter-sawn solid floors can work, but most manufacturers and fitters, us included, avoid solid wood over underfloor heating.

Our range

Every board suitable

Every engineered oak floor we supply is suitable for underfloor heating, including wide plank, herringbone and chevron. The spec sheet for each floor gives the manufacturer guidance.

Thickness and heat output

Thinner boards let heat through more easily; thicker boards last longer.

Wood is a natural insulator, so every millimetre of board adds a little resistance between the heating and the room. Most homes with underfloor heating suit a 14mm or 15mm engineered board, which keeps that resistance low while still giving a 3mm or 4mm oak layer that can be sanded in future.

A 20mm board also works over underfloor heating. It is the better choice where the floor height is already fixed by the screed, but the heating system needs to have enough output to warm the room through the thicker board. We check that with you before specifying it.

Glue down, don’t float

How the floor is fixed matters as much as the board itself.

Over a heated screed we glue the floor down with a flexible adhesive across the whole area. Full contact means the heat transfers evenly and there are no air pockets, which insulate and can cause hot and cold spots. Floating floors over underfloor heating are possible on some systems with a thin, low-resistance underlay, but glue-down is the more reliable result.

Before fitting, the screed must be fully dry and the heating commissioned. The usual approach is to run the heating, then turn it down while the floor is laid, and bring it back up gradually over a week or so once the floor is down.

Living with it

A few simple habits keep a heated wood floor in good condition.

What we recommend

Keep the floor surface temperature at or below 27°C, the limit most wood flooring manufacturers set
Change the temperature gradually rather than switching from cold to full heat
Keep indoor humidity steady, ideally between about 45% and 65%, especially in winter
Avoid thick rugs over heated areas, which trap heat under the floor
Expect small seasonal gaps between boards in winter; they close again as humidity returns

Wood Over Underfloor
Heating, Answered

The questions we are asked most often.

Ask Us Anything →

Can you put wood flooring over underfloor heating?

Yes. Engineered wood flooring is designed for it. The cross-laid core keeps the boards stable as the heating warms and dries them. Glue it down over the screed for the best heat transfer, and keep the surface temperature at or below 27°C.

Is engineered or solid wood better for underfloor heating?

Engineered. Solid wood moves too much as the heating cycles, which leads to gaps, cupping and noise. Every engineered oak floor we supply is suitable for underfloor heating.

What thickness of wood flooring is best for underfloor heating?

A 14mm or 15mm engineered board suits most systems, because it lets heat through easily while still having a sandable oak layer. A 20mm board works too where the floor height demands it, provided the heating has enough output.

Can herringbone or parquet go over underfloor heating?

Yes. Engineered herringbone and parquet blocks are glued down over the heated screed in the same way as planks. Small blocks are actually very stable over heating because each piece moves so little.

Should wood flooring be glued or floated over underfloor heating?

Glued, in most cases. Full adhesive contact gives even heat transfer and a solid feel underfoot. Floating is possible on some systems with a thin, low-resistance underlay, but we prefer glue-down.