I'm ready to tackle my new shower. Right now I've got 6 by stud walls and
insulation (no sheetrock). I'm putting up 1/2 backerboard then tile. Do I
need to put some sort of waterproof layer under the backerboard, such as
plastic sheeting, or can the backerboard be screwed directly to the studs? I'm
sure this has been addressed before, but-- any compelling reason to chose
concrete backerboard over Hardiebacker?