Whist tearing off the roof, I’ve found some interesting things. The plywood looks to be in fairly good shape. The tar paper is still on as I’m using that to spot nails easier. I’m pulling the ones I find that were used for the shingles. Lucky me, the person who put the roof on used roofing nails instead of staples to hold down the tar paper. SO that means, there’s about 200 lbs of nails on the roof.
I’m leaving the ones that had the tar paper as they’re driven flush. Anyway, I’ve got pictures of a sample of the nails I’ve found.
I’m going to be replacing the plywood near the vents anyway. Any thoughts on the nails? From what I could tell, there were no nail lines on the old shingles, and the installer nailed where ever the hell the nail landed…there was no rhyme or reason to the spots he picked. They tended to be up high on the shingle and they were all for the most part covered.
Anyway, the top ones are really bad, there are about 10% of the nails are in this bad of shape. The middle ones are the majority, probably 75-80% while the bottom one is mainly found on the edges.
I believe that the majority of them that are rusted on the bottom are from a high humidity attic, is this correct? The really bad ones were found mostly at the eves and around the vent stacks. I’m guessing ice damning and leaks by the vents. The plywood doesn’t look water damaged though, at least not what I would expect.