Tile backer boards types and size
Are you familiar with Ditra? That's the way I'd go.
Otherwise, CBU of your choice. Any CBU product in 1/4" will work fine. Use alkali resistant screws to attach, use alkali resistant tape and thinset over the seams.
Too late now but for anyone else reading this, TCA Handbook (tile bible) calls for exterior grade plywood, not CDX. The grain of the ply should run perpendicular to the joists. Do not align the CBU with the ply but stagger the CBU seams and leave 1/8" gap around perimeter.
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Last edited by angus242; 01-07-2009 at 01:55 AM.