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Heave Steve, for the good of the country
reply to cowboyro

Re: Subfloor thickness for tile?

Use min. 3/4" glued & screwed plywood.

If you are lifting the existing subfloor anyway, you'll have the joist cavity open.

1) Make sure that any joists which may have been cut by a butcher plumber are repaired.
2) Make sure that you have blocking installed between the joists to stiffen the floor. Not further than 4' OC, and preferably closer than that.

If you have drain pipes in the floor cavity, you can
a) take a piece of blocking material (eg. 2x10) and 'locate' the drain pipe on the uninstalled blocking.
b) cut a hole for the pipe in the correct location
c) slice the blocking horizontally to create an 'upper' and 'lower' piece of blocking.
d) slide the lower blocking under the pipe and fasten to the joists, then install the upper piece of blocking.