Underfloor Heating

Marlie_Marlie

Hello

Need some advice regarding underfloor heating.

We are having an extension done to the kitchen/dining room where the new extended area is concrete flooring. Underfloor heating pipes will be perfect there as the builders will screed above it.

However, on the old area the flooring is different as it is just a concrete block with thin insulation and plywood flooring above it.

Any advice what I can do in the old are as the wide really wants underfloor heating?

Thanks

Marlie_Marlie

Also how much insulation is needed for heated flooring pipes?

Many thanks

FreeBear

Marlie_Marlie wrote: »

Also how much insulation is needed for heated flooring pipes?

That depends on a number of factors. The size of the floor, the subsoil, required u-value...

At a minimum, you'd want at least 75mm of Kingspan/Celotex, 100mm would be better, and 150mm would give you a well insulated floor. If the existing (old) floor is beam & block construction, I'd be tempted to lift it and pour a new floor at the same time as the extension is done - Doing this would mean the floor would have the same performance across the full area. Also less likely to get a step between old & new.

Your architect would be best placed to answer most of these questions, but be aware that what ever you do is going to increase costs over the original estimate. However, the cost of doing it now is going to be less than doing it in a few years time, and with a lot less upheaval.