Mon, Jul 06 2009
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Published August 20, 2008 07:47 pm - Uneven coloration on the roof of the new covered bridge between Ashtabula and Plymouth townships is typical for the product and not a reason for concern, says Tim Martin, Ashtabula County engineer. Zinc roof covers bridge Uneven coloration on the roof of the new covered bridge between Ashtabula and Plymouth townships is typical for the product and not a reason for concern, says Tim Martin, Ashtabula County engineer.
The roof, made of heavy galvanized steel, has dull spots in some sections. Martin says these spots occur because of variations in the strength of the zinc plating bath, but should not compromise the metal. Galvanized steel was chosen for the roof because of the high maintenance that would associated with an asphalt roof. “It’s a wind issue,” says Martin, of the roof, which is more than 100 feet above the Ashtabula River Gulf. The metal roof should provide at least 40 years of service before requiring attention, he says. While the roof is highly reflective at this point, he says it will weather to a dull gray after several years of exposure to the elements. Some visitors to the bridge also have wondered when the balance of the siding will be installed on the sides. It won’t be. Only the pedestrian walkway has siding; the bridge sides are otherwise left open, again because of the high winds that will buffet the 613-foot-long structure. 
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