joints in subfloor

Old 09-16-05, 06:58 AM
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joints in subfloor

We going to lay porcelain tile using hardibacker over two layers of existing
layers of 5/8 plywood.The plywood is butted tight at the joints.My husband
wants to trim out the edges of the plywood joints with a circular saw and
fill them with caulk-is this a good idea or even necessary?Should the joints
instead be filled with thinset when putting down the cement board?Thanks
in advance.
Old 09-16-05, 03:56 PM
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Always a good idea to have an expansion joint between the sheets of plywood and yes, caulk would be better than thinset there.

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