Insulating a “3-Season Room” or Sunroom in the Mid-Atlantic
My house was built in 1955 with a north-side carport (driveway extended under, roof extended over – including attic with loose-fill insulation, supported by four load-bearing brick columns presumably with footers below) – in the 70s, it was closed in (2×4 framing, plywood, vinyl siding, and jalousie windows. It was ducted for heat and air conditioning although the ducts remain closed. Since we moved in, we replaced the windows with nicer/newer/normal vinyl, and we replaced our HVAC and had them size it such that it would support the sunroom if it were ever insulated/sealed.
My loose plan has been to replace the two doors which are just simple unsealed storm doors, insulate the open wall cavities (the plywood is only on the exterior side of the framing) with either XPS or Roxul Mineral Wool, remove/replace the vinyl siding after adding house wrap beneath it (since they omitted that step), and I hadn’t thought of the floor beyond putting down dri-core as a subfloor with tile over that.
Are these reasonable plans for making this formerly 1-season room 4-season livable? It’s hard to find direction for this eventual project for a house in the Mid-Atlantic. Especially for the floor which is essentially just the driveway with a few coats of epoxy paint.
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