In practice, do professional roofers cut metal roofing with circular saws?
Directions for the metal roofing that I have seen say not to cut it with circular saws or grinders -or abrasive disks in general. So I gather that the theory of cutting metal roofing implies using shears or nibblers ( be they powered or hand operated). I find that shears don't work well in cutting across ridged surfaces. So that leaves nibblers. However, there are many videos online showing people cutting metal roofing with saws. Are there special blades that make this an approved method?