Hey. Need some advice. I want to insulate my cold room in the basement under my front porch. It has a vent outside and an exterior door. I’ve already tried to seal it up, but ended up having a ton of condensation on the ceiling, I don’t think I had it sealed up well enough. I want to use the room for storage. Before in the winter everything would freeze and in the summer was super musty and humid. I’ve torn everything out and want to do it proper. I’ve filled the vent hole with spray foam and removed the exterior door. I was thinking of using 1.5” durafoam insulation board on the ceiling and the exterior walls. PL it to the concrete, seal all the seams with elastic caulking, and blue vapour tape, and make the area complete sealed so no warm air from the basement meets the cold concrete walls. Or am I totally off?? Thanks for the help. I’ll include a couple pictures.
