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Before applying a second layer of shingles, I walk the roof-checking for spongy spots, and follow that with an inspection from the attic side. If poor detailing or flashing has allowed deterioration of the sheathing, that must be corrected prior to installing the new layer of roofing. Also, I won't install a second layer if the existing shingles are curled at the corners and are highly brittle. In that scenario, you end up with a broken mess in between the roof sheathing and the new shingle layer. Finally, if the existing shingles were stapled on, they must come off. I won't risk my reputation by topping a bad installation.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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