re: Metal roof question

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I built in 2013 and went with a Galvalume metal roof.My house is a farmhouse style with 12 on 12 and it breaks to 6 on 12. I have 4603 sqft under roof and it cost 15800 for the complete job.The guy that did mine has been metal working for 30 years and did a great job.He used ZAK screws which have a metal hood over the gasket so it doesnt see sun or rain.My roof is decked with 7/16 OSB for strength.I went with a synthetic felt and put 2x4 lathing on it.It came out dang good and I would do it again.I never priced shingles so not sure how it compares that way.

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Hooded screws are a great solution for a panel roof. I agree that exposed washers on the standard fasteners are a weak point for metal roof installation.

Standing seam is the ultimate system but can be a deal breaker for a residential application due to cost.

There really is no such thing as a "lifetime" roof but a standing seam metal with a good finish on it comes close.