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There are many opnions on this. I guess, originally, the seals were only adhered along the bottom and the rest of it sat in the channel. Presumably, this was for easy cleaning of dirt, leaves, debris. Many people seem to feel better about sealing the whole thing all the way around. My seal is only adhered at the bottom but I'm getting a little leak from somewhere so I'm going to seal it at the top too.
see this informative thread from a few days ago:
http://www.brickboard.com/RWD/index.htm?id=969757
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