My roofer said if I ever see a screw coming out of a metal roof, go over there and replace it with a slightly larger screw. I've only used two of these so far. Before screwing in a new screw, I coated it with sealant. So far, so good. There are no leaks yet. My roofer is also one of my good friends and lives about 80 miles from me. No need to call him to replace a screw or two when I can do it myself. I helped him install the roof.
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