I have an existing asphalt shingle roof that meets a sidewall. Unfortunately, the underlayment does not lap up the wall and there is no step flashing. And of course, the siding and sheathing has now rotted. I am in the process of replacing the siding and sheathing on the sidewall, but am wondering the best way to flash this. I can easily add step flashing to the existing roof, but I can't think of an easy way to add underlayment without removing shingles. Any ideas?
Remove the shingles and check the roof deck. Cances are the roof deck is also water damaged. Replace as necessary.
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