Hi all, I just read about two hundred posts on attic insulation and couldn’t find my specific frost and condensation problem. I would be super appreciative of any DIY advice because I can’t afford to hire anyone right now. My current two winter problems that only show up when outside air is 30F or less: 1) condensation above/around bath exhaust fan box- there are water droplets on the nail heads through the sheathing, moisture everywhere and at times a very wet interior ceiling around this exhaust fan (there could be condensation/moisture in other parts of the attic that I haven’t seen or discovered). This is only when it is cold, NOT when the bath/shower is/was in use. 2) Attic frost on the eaves and roof sheets, but only in the northwest corner of the house (again, could be other parts I haven’t seen or discovered), and I get water condensing (or seeping?) at the joint of my interior wall and ceiling in this corner. At this corner of the house there are no canister lights, no plumbing vent stacks, etc, but I did notice the blow-in in the attic seems pretty sparse.
My set up: late 50’s single story ranch over a basement with a 950 Sq Ft crawl space attic under a 12/4 (maybe 12/6) roof that has overhangs, no soffits, no ridge venting, the ridge runs east-west, and gables (no fans) at each end, maybe 4’ x 4’. We’re in Washington DC area so it gets cold but not a lot of snow. I bought the house two years ago – at some point in the past insulation was blown in but I have no idea how much or how well it was done. When we moved in we had down lights and the bath exhaust fan installed and the electrician only halfheartedly replaced/put back the disturbed blow-in.
So I clearly have heated air making it into a poorly ventilated attic. I’m on a tight budget so what should I do? My DIY ideas are:
-Put in soffit vents? How do I figure out how many?
-Put in an attic fan at the east gable (we have mostly NW prevailing wind) on a humidistat? With or without soffit vents?
-Can I add blow-in by hand around the canister lights and fan box? In the northwest corner? Or should I try to add fiberglass batts or roll? Do I put down or add any kind of moisture barrier? Should I break out the caulk gun?
Finally, this house stays pretty cool in the summer thankfully. Thanks a million for any ideas!!