I used 24 inch wide aluminum flashing, but only near the exhaust. It is so flexible that no effort is needed to bend it. In fact, in a few places, I used 1/8" and 1/16" thick by 1" wide aluminum bar stock as framing to keep it and the coroplast in place. In most places the coroplast didn't need support.
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Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.
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