Bathroom floor

[JCH]

Hi all

I need some advice please. We're redoing our bathroom, we had a seperate toilet to the bathroom but now we've made it one big room, so now we can fit a shower in, I've bought a 1200 x 800 preformed wetroom tray for the shower. The shower will be in a corner of the bathroom and will have a glass screen along the longest side with a small (smaller than the width of the shower) swivel panel on the end. Our floorboards are 20mm thick and in good condition, joists are about 400mm centres. We've chosen some porcelain floor tiles that are 500x300 and am trying to find a matching mosaic tiles for the shower tray. I'd aslo like to put a underfloor heating mat in and already have a tanking kit.

Could you tell me what I need to do to the floor. I was thinking of 12mm overboarding the floor, priming and applying the tanking, laying the underdfloor heating and then tiling.

I've read lots about the use of SLC and plastic matting that detaches the tiles from the substrate but am not sure about the SLC and the shower tray and I'd like not to bring the floor level up too much. I've also seen that people remove the floorboards and replace with 18mm ply.

Any advice would be great!

Thanks
james

 

[AliGage]

You only need to just cover the mat. Especially if your replacing the floor boards. There shouldn't be a need to "level" so in which case allow about 5mm.