When cutting length wise I score it a few times with utility knife and then snap it over. If it’s scored right it’ll snap off. Cutting over the humps I have had best results with my angle grinder with a 1/16” abrasive wheel.
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Added; ear muffs for sure.
Are you kidding me? Cutting metal roofing by scoring with a utility knife? I never heard of that, it seems like it wouldn't work.
