Underlayment

[RedWing]

I have a house built in the early 40's so there is a 1"X6" plank sub floor. In order to strenghten it up, I glued and screwed 3/4" tongue and groove plywood over it after securing the planking with screws. The floor is real sturdy now but, unlevel. I plan on installing a natural stone floor over it after a layer of 1/2 cement board. The question I have is, is it better to level the floor with leveller before or after the installation of the cement board? Regards, DA

[hallerb]

do the cement board first if the lack of level is minor.

if its major level best you can, add cement board, then level again.

you have created a trip hazard with the 3/4 plywood plus cement board..

why didnt you remove the plank subfloor then put down plywood? i still believe this is a good idea.

how will you transition such a large grade change?