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Hi all,

We are refurbishing our bathroom (located on the first floor of a small Victorian terrace property)
Existing floor construction is 18mm floorboards on joists and our ideal finish is tiled floor with under floor heating. The build up that has been suggested to us is a 12mm tile backing board on top of the floor boards, then the heating mat and then the tiles LVP flooring contractors(15mm thickness).
My issue with this is the added thickness of this construction in relation to the floor level outside the room, so I was thinking of replacing the floorboards (which I could use elsewhere in the house) with a thin rigid board fixed to the joists, for example 9mm marine ply with a maybe thinner tile backing board. Is it advisable or will it flex too much? Not sure about the loading strength either...
Any advice would be much appreciated
 
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