One thing can be said for a roof "go-over" is that, "lost" roofing nails scattered around the drip line won't be found by little feet. Some designs are worse than others:
Quote:
Originally Posted by Dave M
To tell the truth after the 1st layer has been on there for 20-30 years I'd rather pull 1st layer off to see what the roof is like. I've removed 1st layers from houses and found problems with the boards/plywood/drip edge etc. Will always pull off the 1st layer. More money yes, easy of mind priceless. You know when you'll have a problem, right. Dave M
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My neighbor, otherwise very conscientious, layered-over his 1953 roof.
It grew moss very well!
Seventy years later, a new owner added a second floor. The old
3/8ths-inch plywood roofing was carefully removed and stacked nearby. Aside from a few tar stains, all the plywood appeared in pretty good condition.
One factoid I learned from reading-up on plywood construction: in those days, the "glue" that held the plies together was cow's blood.
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