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Might as well not bother with the UFH! If there's ply and decoupling membrane between it and the tiles it'll be the least efficient heating system ever. You want the tiles, adhesive and UFH screed to be one solid slab.
At least you have rigid insulation under it all 👍
dbr-
It's more a try and take the chill out of the tiles type system.🤣 Hopefully will do something. I do need to get some proper calcs done for the rest of the house though. As you can probably tell, I'm not known for my good ideas and this project is a huge mishmash of weird ideas that probably don't work. I assume that's what's happening anyway re the floor and the ply is staying there.
user67526
No heat calcs but as long as it takes the chill off the floor on a cold winter morning, then it's all good. It's only 4.2sqm There's a huge sheet of insulation under the pipes so should be good. All the heatloss will be through the sweet single glazed door 😂. The ply will be going down over the top of the pipes, then ditramat (sp?) then 60x40cm Limestone tiles over the top.