Wet Under floor heating

25 Nov 2019
Reaction score
United Kingdom
I am planning to fit single room ufh in my extension - problem is the 100mm celotex is already under 50mm concrete slab - if I screw down the pex pipe using copper 2 hole pipe clips directly onto the slab and lay 50mm screed on top will the ufh heat the room (knowing that I will have some downward heat loss until it hits the celotex) I’m aware of the overlay boards but trying to keep the cost down and the boards would be £400
Last edited:
Sponsored Links
You might be able to break up and dig up that 50mm concrete slab in a few minutes with the right tool!

Aldi do a breaker which looks the same as the draper one, and it's £80. Or hire one!

(may be more £££)

Last edited:
I'm no expert but.....I'm not sure I would regard that as heat 'lost'. Eventually it will find it's way into your room (assuming there is no thermal briding issues). The floor will just react slower to a change in temperature because it's heating more mass, but IMO it would be fine. Could always use closer pipe spacing to compensate.

A screed layed in two 50mm layers? I guess it would be fine, but worth looking into maybe.

But as Nozzle said, probably wouldn't be too difficult to get it up.

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Sponsored Links