Question for the experienced metal roofers out there. I have a metal roof on one of my outbuildings. The building was an old chicken coop, that was turned into a hog barn, then into a stable. Currently I use it to store wood for the fireplace insert, and to store machinery. The roof is galvanized steel, and is a constant "wave" up and down, each "wave about 1 1/4" tall x 1 1/4" wide. It is starting to leak in spots where the rubber washer nails were used to attach it to the building. The roof of the building is lathe strips. I'm guessing that the roof is 30+ years old. What can I do to seal the roof other than tear it off and start over?

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