I have been working on an old family owned house that has fallen into disrepair. I'm not sure the folks that took care of it knew what they were doing. Here's what I have.
From inside to outside:
Plaster walls, empty space (2x4 equivalent), wood siding, foam board(probably 1/2 inch or less), and finally vinyl siding. I'm thinking of how to insulate the walls There is absolutely no insulation in the house; I'm planning to blow in the attic. The house is located in Charlotte, NC. The house is 1000 sq. ft.
My bill for heat at a mere 55 degrees was just under 100 bucks last month. My question is this: Should I even bother insulating the walls at all? I'm interested in the pour foam process, I've heard blown fiberglass in the wall is a bad idea. I suppose I could pull batts through from top to bottom but that would be alot of work. God knows I don't want to do any of this from the plaster side.
The upside of this house is during the summer, with no AC, the house stays comfortable (thanks in no small part to some big shade trees). If anybody has some general advice on this topic I would greatly appreciate it.