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The height is usually just about matching thresholds. If you are on joists then reinforcing them might help to reduce flex. If you put 18mm ply over the floorboards and you can get away with the increase in height at adjoining floors then by all means do that to increase strength in the floor.
Generally I don't tile on suspended floors because the movement leads to grout failure or tile cracking or both.
Airhead
CYOA
Thanks
Why is this? I would have thought the more floor, the more solid underfoot it'd feel. I remember my father in law having karndean in his kitchen and it always felt like a school dining hall with concrete underneath.