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Remote Name: 220.127.116.11
Date: November 15, 2002
When I've run into the "oil can" effect, it's usually caused by dents or creases which have affected the rigidity of the sheet metal. Usually, bringing down the high spots and raising the low spots, in other words getting rid of the dents and creases, causes the metal to strengthen itself again. Look for low or flat spots in your roof. I've found them to be most common around the outer edge of the roof, like about six inches to a foot in. They might not be very obvious, but they are there. And where there's a low spot, there is usually a high spot or ridge at the edge of it. Good luck.