18mm floorboards atm, with 8mm ply and 10mm tiles on top which felt fine, I’d be happy with 20mm step.
Remove boards and add 2x 18mm ply + 20mm tiles + adhesive =40mm.
The two sheets of 18mm were recommended by one company who supply terrazzo and no one is willing/capable of any sense checking or alternative which is pretty frustrating.
My builder is great but he’s not used terrazzo before so understandably doesn’t want to deviate from recommended.
Looking at what Diespeker have 10mm tile wise, both genuine and faux (the later requiring less floor build up).
I think EC used single 18mm ply for downstairs porcelain tiles.
What about bracing existing and adding additional joists and using 24mm ply over that - would get you to about 30mm ?
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