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post #2 of Old 08-26-2009
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It's pretty common to have polysulfide caulk laid in the seams -- most caprails are intentionally built with small gaps to act as expansion joints like you see in concrete driveways and sidewalks. However, to be effective the gap's gonna need to be a 1/4" or more for the caulk to do its job of stretching before becoming detached.
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