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What's the approximate weight per foot of a metal roof? -- including typical insulation... not the rafters though, of course.
how does that compare to other materials? Seems like I read about it somewhere here, but I can't find any answers.
John
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Metal roofing will weigh from about 45 pounds per square for aluminum up to as high as maybe 125 - 140 for some steel products. Asphalt / fiberglass shingles from from maybe 275 up to 450 depending upon the product.
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sorry, Todd. Where'd I get Tim?
I guess I'm wondering not so much about the insulation as the under-layer... is that plywood? that's got some weight to it... does your estimate include whatever the metal needs to attach to, or just the metal? (rafters not included of course)
Tys
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1/2" plywood will weigh about 45 pounds for a 4 x 8 sheet. Roughly 135 pounds per 100 square feet.
Some metal roofs can be installed over battens rather than decking but you must have a well ventilated area beneath that.
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Hi Todd: I recently posted a question re: Corrugated Metal Roof Repair.I happened to see this response. My house was built in 1910 and it has 1x6 boards instead of plywood. If your answer to my original question is to replace my roof would I need to remove this boards and replace with plywood because of the weight factor? I was told that three roofing layers is the most you can have with shingles because of weight.
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