05-25-2022, 08:42 PM
I enclosed a concrete-floored porch that sits atop a garage. The garage has a low ceiling so I did not want add thickness there. And I was limited on the topside, as well, to match the level of the main house. To insulate the floor, I tacked down 2x3 sleepers flat in joist spacing, and filled the voids with rigid foam. I put OSB on top of that. That combination brought the floor up to near perfectly match the main house. Then padded carpeting on one part and luxury vinyl tile on the other. I don't notice a cold floor on the vinyl or the carpet in that room.