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Robert Neville

wrote:

Why can't I (or a sheetrock guy) just tape the seam where the
backer board and the sheetrock meet? Is backer board thicker
or thinner than the green board that's already up?

Thanks for any help you can give me.

nancy

Because you NEVER have an unsupported long (vertical) joint between
drywall and drywall, drywall and backer board, or backerboard and
backerboard. Any flex will damage the joint. There IS an option when a
wall is open. Add another stud at the point the 2 panels will join.

What he said. And that you don't tape the seam between sheetrock and
backerboard. Tile should completely cover the backerboard.