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Unread 01-19-2022, 06:33 PM   #6
cx
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Join Date: Jul 2001
Location: Boerne, Texas
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Welcome, Steve.

By your description, I think your floor would need to have joists of exceptionally good species and grade to meet code if calculated with that much added dead load. Adding another, say, five pounds per square foot will make a difference, but, like the others above, I'm not engineer enough to say whether it's a good idea or not.

I was not even aware that Schluter had such a primer available and I'd appreciate a link to the product if you have one. Along with MAPEI, Custom Building Products also has a useful primer, Multi-Surface Bonding Primer, for tile-over-tile installations.

My opinion; worth price charged.
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