On May 2, 4:20 pm, "
wrote:
I am renovating a bathroom. The rooms is stripped to the studs with a
plywood base.

I plan to put a layer of cement board down over the plywood as a base
for the tilers to work on.

The plywood is rather uneven so the cement board will ride over
ridges.

Is there some kind of compound I should apply first to level out the
floor before the cement board or should I simply not be concerned?

You could "laminate" the cement board to the floor with thin set. It
should level out the ridges and also should serve to make the whole
floor stronger.

JK