Step one was to take care of the cement board underlayment. I went with Permabase 4'x4'x1/4". I was concerned with removal of the existing layers of vinyl flooring, as I'd bet that at least the older layer was made with asbestos. Instead of removing the layers and risking the health issues, I removed the loose areas and leveled it with thinset before installing the Permabase. Once each sheet of Permabase was installed, I used screws (a LOT of screws) to hold everything down. Yes, I know that having four corners of cement board coming together at the same place isn't the best layout.
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Step two was taping the joints. I liked step two, because it took only a few minutes. Step one was the better part of the day and left me with an aching back from being hunched over for hours.
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