"Steve B" fired this volley in
:

Any other ideas how to cut these? I do have a DW890 sheet metal
cutter, but where there are ribs, it will not follow the contour very
easily. I COULD use a 7" circular saw at those points, it would just
be a lot of work.


Although the Galvalume guys will tell you that using anything but a shear
voids the warantee, almost all the professional pole barn constructors in
this neck of the woods use a diamond saw to cut 5-vee, and standing-rib
barn metal. It works pretty well, if very noisily.

The reason the manufacturers say it's bad to saw is because a shear tends
to wipe the plated layers across the cut, while a saw (supposedly) leaves
the end clean and bare.

I use a power shear (Malco "Turbo-Shear" drill attachment). It's a tiny
bit of a chore moving up and down ribs, but not as bad as you might
think. The nose of the cutter has a geometry that allows you to follow
the ribbing without much distortion.

LLoyd