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chrisbmx116
Floorboards https://www.wickes.co.uk/Wickes-P5-T+G-Chipboard-Flooring---22mm-x-600mm-x-2400mm/p/164536
Backer boards - benefit of polystyrene core boards is that they stop water soaking in as well as not disintegrating/rotting when wet.
https://www.insulationexpress.co.uk/marmox-multi-board
Waterproof tape
http://www.marmox.co.uk/products/accessories/waterproof-tape
I just used standard flexible tile adhesive to fix the marmox down - ended up with solid floor that doesn’t creak or flex and didn’t make a big step into the room.
Layers bottom to top:
P5 moisture resistant floorboards
Flexible tile adhesive
Marmox boards
Marmox tape (seams and edges)
Flexible tile adhesive
Tiles
Thinking being that if the tiles or grout fail, the layer underneath is essentially tanked and it that fails, the layer underneath can cope with some water.