Do I need to add plywood underlayment over plywood subfloor?

Question

I am replacing downstairs flooring that had three layers before the subfloor. Linoleum, Cement Board and Tile. All flooring had to be removed down to the subfloor due to water leak. Since the cement board was screwed it, it is causing uneven areas as the screws are pulled/removed. Should I lay 1/4" or 1/2" plywood underlayment on top of subfloor before installing LifeProof vinyl plank flooring?

If so, what do you recommend? Should I also glue this new underlayment on current subfloor and screw down as well?

The goal is to not have any transition pieces from room to room, while making sure flooring is level with no dips or valleys.

Ed Beal · Answer

I prefer underlayment On top of sub flooring if there are a lot of bulges from the screws I would put a thin layer of spackel or self leveling cement down then the sub flooring. 
If you use a pad the vinyl plank may be fine on the existing Sub floor but when redoing my houses I want it nice so I would use an underlayment.

The problem with plywood is knot holes and blows will end up showing through over time with some floors underlayment is cheaper and better for this case. Always stagger the seams don’t put any new seams over the old ones.

Do I need to add plywood underlayment over plywood subfloor?

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