Hi all, currently renovating my 70’s property, I have a suspended timber floor with 18mm floorboards. I want some electric underfloor heating with porcelain tiles to finish. There’s a small amount of bounce in the floor, my plan so far is as follows; Existing floorboards 18mm ply overboard for strength & rigidity fixed with D4 adhesive and screwed at 200mm centres with 30mm length screws Primer Electric UFH Latex screed Tile I was also thinking of sealing the gaps in the ply with polythene tape? Or even putting DPM under the ply? To stop the screed disappearing below the ply & floorboards? Or would this cause an issue with damp/condensation? Does anyone see any problems with the above? Please could you also suggest a suitable primer & latex flexible screed brand? Thanks all James
We don’t really deal with tile here, but I would personally beef up your joists to help with the bounce, board out the joists with structural ply/osb then the ufh insulation boards and finally use something like this https://www.cosytoes.co/files/instructions-loose-and-decoupling-mat-cable.pdf always use a decoupling membrane under tile to prevent cracking of adhesive and grout. Sent from my iPhone using Tapatalk
Thanks for your reply! So you’re saying to place the decoupling membrane on the ply, sinking the cable into the membrane, and then just tiling straight over the top of that with no screed? As the wire won’t be damaged via tiling if it’s sat nicely into the membrane mat? so we go; Existing floorboards Overboard with ply Primer? Decoupling membrane Electric UFH cable Tile removing the need for screed/dpm/polyethene tape etc? That sounds good to me!
Insulation boards onto the ply then the decoupling mat on the insulation boards, then tile over, just make sure to beef up the joists so there’s no perceivable movement in the ply before cracking on and always prime the ply, need to use flexible grout and adhesive for those I would recommend Ardex AF200 for the matting and Ardex X77 for the tile Sent from my iPhone using Tapatalk
