I'm setting Hardiebacker in a bathroom tonight. 1/4" square notch
trowel, polymer modified thinset, set the backer board and then nail
it down with 1 1/2" galvanized roofing nails. Questions:
1. How soon can I work over top of the backer board? I'll end up
sitting on top of fresh work to put down new boards. Should I let it
set up first or can I keep working? Time permitting, I'd like to go
straight to laying out the tile as soon as the boards are in. Or
should I wait until tomorrow?
2. None of the nail spots on the backer board line up with the floor
joists. Is that normal? Should I ignore the pattern and nail into
(btw: New exterior grade 3/4" plywood, glued and screwed over
existing 1/2" plywood. 2x8 joists 16" o.c., 1/4" hardiebacker, 1/4"
6x6 ceramic tile with flexbond thinset.. Hoping this is okay.)