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Hey Dave. Thanks for the reply. Thinking about this a bit and I can see your point. Its the heating that would change the dynamic here.
One of the potential methods I was thinking about is to minimize the depth of mud between the joists, bring the mud up to the top of the joists, then put 3/4 Kerdi board screwed to the joists and bonded with thinset to the mud.
Any thoughts on something along these lines?
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Dave
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