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I'm going to disagree with everyone that said ACM is not strong enough. by itself. I installed a double sided sign where the upper part was 2 sheets to make an 8' x 8' panel then a 2 foot gap with a 5' x 14' bottom panel. I installed wooden stringers onto steel wide flange beams 30 feet tall. I fastened the panels with good sized pan head screws around the perimeter and also had a few cross wise stringers. The sign took a direct hit from an F1 to F2 tornado which ripped the roof off their steel building and twisted the steel poles a bit, but all the panels stayed intact.
Who wouldn't use stringers with ACM? To me that's a no brainer. Heck, as lousy as MDO is now, I would't install any permanent MDO sign without at least a perimeter frame. That stuff can curl like a Pringle. potato chip
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