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Deteriorating exterior caulk

Posted by Duke Holt on April 23rd, 2003 05:51 PM

2 years ago we had a contractor repair our skylite on the roof which required caulking metal and glass seams. We have had periodic leaking during rains. The contractor is now telling us that the caulk deteriorated due to concrete dust from a nearby construction job. He says lime in the dust breaks down the chemical compound in the caulk. Does anyone has information on this subject?

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