Underlayment or not?
I am putting 24x24 .040 thick porcelanosa tile over Ditra heat duo. Existing sub floor is 3/4" plywood. Joists are 2x10, 16" OC, with the area under the free standing tub (11' x 11') having all joists doubled up. Do I need to add an underlayment or will the ditra heat duo serve the purpose?
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Probably just shy of that.