After careful consideration I have decided not to tile over my oak
floor and instead rip it out down to the subfloor, and would like to
install plywood and backer board for a new tile install. I have 3/4"
subfloor and can only go an additional 3/4" more due to height
problems. So here are my options to put over the 3/4" subfloor.
a) 3/4" plywood
b) 1/2" plywood plus 1/4" backer
c) 1/4" plywood plus 1/2" backer
Either choice would give me a combined floor of 1 1/2". So which would
a) Is probably your best choice, since the 3/4" plywood is stiffer
than the other choices, and it is perfectly acceptable to glue (thin-
set) tiles directly to plywood.
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