Pull it off.
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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