First off, mortar is number one. But applying mortar for walls is
definately not for an amatuer. As for your choices, I quit using
Durock, Wonderboard, Crumblecrap (whatever name it goes by now) a long
time ago. I use nothing but Hardibacker for floors and recommend it for
counter tops, tubs and shower wall substrate. it's just a superior
product and easier to use IMHO.
For installing the backerboard it helps immensley if you make sure your
walls are plumb and the enclosure is square. Run a straightedge
horizontally across the studs to check for any that may be bowed as
well, and correct that beforehand.
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