Dunno if this is really an appropriate question, but people here seem to cover lots of trades.
Lookin in the attic, I can see some areas are black. Mostly close to the bottom over the eaves (2' overhang). Mostly black mold is harmless wrt health. And whatever problem caused it might have ended 25-30 years ago when I put a 2nd layer of shingles over the first. Or not, if it condensation from inside.
Also see stains around nails -- Hmm, should see if only half have stains (1st vs 2nd layer)
Today in sub freezing I can see some frost down on the soffet boards, and here & there frost on a nail. But not on the sheathing.
So when I eventually replace the roof & the sheathing is exposed, what is the accepted test for replacing areas of sheathing? Black on top & bottom? Hitting it with a heavy hammer to see if it breaks through?
Also trying to figure out cost per square for the various aspects of a roofing job
-- removal of 2 layers
-- disposal costs for 2 layers
-- installing a ridge vent
Lookin in the attic, I can see some areas are black. Mostly close to the bottom over the eaves (2' overhang). Mostly black mold is harmless wrt health. And whatever problem caused it might have ended 25-30 years ago when I put a 2nd layer of shingles over the first. Or not, if it condensation from inside.
Also see stains around nails -- Hmm, should see if only half have stains (1st vs 2nd layer)
Today in sub freezing I can see some frost down on the soffet boards, and here & there frost on a nail. But not on the sheathing.
So when I eventually replace the roof & the sheathing is exposed, what is the accepted test for replacing areas of sheathing? Black on top & bottom? Hitting it with a heavy hammer to see if it breaks through?
Also trying to figure out cost per square for the various aspects of a roofing job
-- removal of 2 layers
-- disposal costs for 2 layers
-- installing a ridge vent