Backer/Concrete Board - How thick?

For a bathroom project, I plan to use backer board on walls and floor.
Backer board used on walls will go directly against studs and for the
floor it will lay on top of 3/4" ply. My local warehouse store carries
backerboard only in 5/16" and 1/2" sizes. Due to size restrictions and
other issues, I'd prefer to use 5/16" for everything. Can anyone see a
reason why this would be a problem?

A DIY book I was reading said the floor should be at least 1 1/8" thick
using backerboard no less than 3/8" (over ply). I'll be 1 1/16" total
thick with only 5/16" backer board. 1/16" isn't anything to worry
about, right?

Thanks for your opinion.

.

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