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We had a new boathouse bilt with a metal roof pan with a very small slope. It is covered by a sun deck. Looking between the boards of the deck, I can see standing water in some places after it rains. Will this decrease the lifespan of the aluminum?
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If the base metal is aluminum, this may not have a huge effect on lifespan. However, ultimately, sure standing water for long periods of time will accelerate the aging of paint finishes and metal.
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There are some metal roofs, such as those commonly used on industrial buildings, which can function well down to a slope of 1/4" in 12".
Every metal roof system will have a minimum required pitch. Many residential products are 3:12 minimum.
12/30/2004
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