'Custom Building Products' recommends...
Start with exterior grade plywood.
Spread a polymer modified mortar on the plywood, like Flex Bond, using a 1/4x1/4 notch trowel to spread the thin set.
Using ½ inch Wonder Board.
Put the Wonder Board on the thin set that you just spread out.
Screw it down with backer board screws (1-1/4'' long) or galvanized roofing nails 1-1/2''.
Then for a waterproofing, use 'Red Gard Waterproofing and Crack Prevention Membrane' over the Wonder Board.
Once the Red Gard is dry, use a a polymer modified thin set (Flex Bond) to set your exterior rated tile or stone.
Assuming the framing is adequate for tile inset areas, with a little slope etc, any thoughts ?
Start with exterior grade plywood.
Spread a polymer modified mortar on the plywood, like Flex Bond, using a 1/4x1/4 notch trowel to spread the thin set.
Using ½ inch Wonder Board.
Put the Wonder Board on the thin set that you just spread out.
Screw it down with backer board screws (1-1/4'' long) or galvanized roofing nails 1-1/2''.
Then for a waterproofing, use 'Red Gard Waterproofing and Crack Prevention Membrane' over the Wonder Board.
Once the Red Gard is dry, use a a polymer modified thin set (Flex Bond) to set your exterior rated tile or stone.
Assuming the framing is adequate for tile inset areas, with a little slope etc, any thoughts ?