Sub floor preparation.

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Quick hello to all who reads & responds to the post.

I'm after a bit of advice and guidance on a floor preparation prior to tiling.
Bathroom will consist of a wetroom with underfloor heating.

In order to keep the floor as low/original as possible I'm thinking of ripping up the old floorboards & fitting 18mm hardwood ply screwed down onto the joists & then placing 6mm insulated tile backing board over the ply.

I'm a lil unsure of how to prep the different layers-
Does this sound correct:

• 18mm hardwood ply on joists screwed down 250mm apart
• Bal single part flexible adhesive with notched trowel on top of the ply and then fix the insulated backer board to the ply with screws & fixing washers.
• Fit loose wire heating & fix tiles to the backer board with Bal flexible adhesive.

Upon tanking the wetroom- should I "overtank" the wetroom by 50mm or so or just the former tray and wetroom walls?

Regards
Jack
 
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I dont understand the post but i would say that "hardwood ply" is unnecessary, likewise WBP ply. Simply use any cheapest, right thickness ply.
 

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