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Granulated roll roofing is absolutely the worst product that you could consider installing on that situation.

A slight step above that would be S.I.S., Seventeen Inch Selvage, which winds up being lapped 1/2 of the sheet each row.

If you choose to use these very inferior products, at least install them with the proper adhesive fully brushed or squeegied in place.

Are you open to other options?

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