Central Heating

What is the best insulation for wet UFH?

Anonymous user 28/02/2024 - 3.29 PM

We are building new extension with wet underfloor heating. The build up is as follows: ground - 14cm of Kingspan - slab - EPS150-3 Grooves@200m insulation (aluminium foil bonded to it) - ScreedBoard 20 Dry Screed Boards - tile adhesive- tile. My questions are: 1) how much of heat will go through the insulation board with aluminium foil (EPS150-3) to the slab below it. My partner's calculation is roughly 35%. It seems quite lot to me I am not sure if his calculation are correct. 2) Is it worth to spend more money on additional thicker insulation below the EPS150-3 and how much difference will it really make? Neither of us are being an expert; we cannot get to the bottom of it. Thank you in advance for an expert opinion.