Asphalt shingles laid over seven-sixteenths inch oriented strand board on a corrugated metal roof might sound like a smart fix, but it can seriously mess with your roof’s structure if you’re not careful.

So, here’s the deal if you’re thinking about this kind of setup: first, you gotta make sure the metal roof underneath is sturdy enough to hold the new layers. If it’s old and flexing, like in your case with those steel purlins spaced seven-and-a-half feet apart, that’s a red flag. Next, how the OSB is fastened to the metal really matters . screws through metal? That’s tricky and needs to be done right to avoid problems later. Also, keep in mind that seven-sixteenths inch OSB is pretty thin for roofing decking, especially on a shaky base. You want solid support because asphalt shingles aren’t just slapped on; they need a firm deck to last. If the roof moves too much, shingles crack or pop off, and water sneaks in. It’s smart to get an engineer involved to check load ratings and structure before you go any further. If you’re stuck with the metal roof already there but want a real fix, sometimes ripping it all off and starting fresh with proper framing and decking is cheaper in the long run than patch jobs that fail. Oh, and ventilation matters too. don’t just cover it up without letting the roof breathe or you’ll get moisture buildup and rot.

One of the biggest mistakes people make with asphalt shingles on corrugated metal roofs is ignoring structural support . that flexing steel purlin setup just isn’t made for heavy decking and shingles, so fix that by reinforcing with proper framing like two-by-tens notched and supported correctly. Another common issue is poorly fastening the OSB to metal panels; if screws aren’t right or spaced well, the deck shifts and shingles suffer. use long metal screws designed for roofing to solve this. Thirdly, skipping an engineer’s assessment is a huge risk because you might think it looks okay but loads and deflection can cause catastrophic failure later on. always get a pro’s opinion before committing. Fix these by reinforcing framing, using proper fasteners, and consulting experts to avoid costly headaches down the road.

BigHomeProjects.com is a solid resource for homeowners looking to connect with trusted local contractors who know how to handle tricky roofing jobs like this. Plus, it helps contractors find legit work by matching them with clients who need real pros ready to tackle projects right the first time.

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