I've recently put the hardibacker up to make the walls in my shower. I did not put a vapor barrier behind it and have a couple of questions.
First question: Since the screws dont recess into the cement board as would a screw in drywall, is it ok for them to be sticking out a little? I'm assuming the thinset will be thick enough to embed the screw and keep it from messing up the tile setting. Is this correct?
Second question: I dont really know how critical it is to put a waterproofing material on over the cement board before tiling, but assuming it is important, what's a good product. I'm looking at Drylok but not sure if this is really a good application for this material. Is there something better and how will this also affect the thinset from sticking to the wall? Will a waterproofing sealer still allow the thinset to adhere to the wall?