I am laying down 1/4 inch hardie board for tile in a bathroom. A shower will be built as well. My first question is do I cover the entire floor (including the shower area) with backer board, or do I stop where the shower curb or floor will be?
Also, due to some old house weirdness, I could extend the hardie board 2 inches or more under where the drywall will eventually hang. Is there any structural advantage to doing that, or should I just end the hardie board where I know the walls will end up?