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How many times can new shingles be put over an existing roof? Two or three times?

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  • Some municipalities or other local jurisdictions disallow overlays altogether. Ask your local inspector's office.
    – isherwood
    Nov 10, 2018 at 15:55

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In the U.S. for composition shingles it is 2 roofs only, then you must tear off all roofs. Also must tear off if roofing is wet, wood, slate, tile or cement. (See ICC 1510.3)

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  • Also, shingles must be properly nested for most warranties (or just decent longevity). You can't haphazardly span voids below.
    – isherwood
    Nov 10, 2018 at 15:54

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