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Pouring 1 1/2 inch lightweight concrete over radiant and advantech subfloor on an interior application. Do you have to prep the subfloor with anything like k 88 or just pour directly over a clean subfloor? Any tips would be appreciated.
Maybe a little late, but you'll definitely want to prime at a minimum. When we do lightweight over Advantech, we also staple lathe down...cheap insurance against a possible nightmare scenario (if the bond between the lightweight and the Advantech were to break).