Insulating Cathedral Ceiling (area around skylight to be replaced)
So I bought my house about five months ago and I have nearly the whole inside tore up. I've noticed what I thought was a poor taping job in the living room/kitchen, one spot being near the skylight. Didn't pay much attention to it as I would be fixing it once the kitchen received renovation this winter.
Well today while doing a little yard clean up I noticed a little sag to the skylight.
Well I investigated further and cut a couple holes with a hole saw. This is where it gets interesting. (Sure enough skylight is leaking)
I have cathedral ceilings throughout the house, turns out I have a 2x4 framed roof, insulated with fiberglass. Covering the fiberglass on the inside is a 3/8" hard paper material (1970s stuff), and covering that is 5/8" plywood. All seams seem to be covered with joint compound and ceiling is painted/textured.
Since I have to tear out a section to repair the leaky skylight and sagging rafter I guess I might as well tear the entire thing out and do it properly.
My question is, what would my best option for insulation be?
I know spray foam would probably be the best R value, that may be out of my price range however.