Standing Seam Roofs

The statement below was taken from a very good article I found on the invention of the standing seam roof panel.

Any deterioration of the sealant in these endlap joints would permit wind gusts to drive water into the joints, causing leakage. At numerous places along the roof, there are areas where two end panels and two adjacent side panels form a four-corner intersection. This area is particularly difficult to seal. Watertightness of the roof has been a recurring problem in standing seam roofs.

I would say I agree with the above article. I would like to add that if an improper amount of mastic or none at all existed in the panel then this would cause leaks by wind driven rain as well.

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http://www.freepatentsonline.com/4497151.html