Quote Originally Posted by Frank S View Post
Standing there watching the 18-year-old apprentice do the work is how I would prefer it done, but I usually score a line with a box knife clamp 2 pair of vice grips 1 to either side of the line step on one pair and pull up rapidly with the other pair, the sheets will usually tear along the line. it works quite well with corrugated sheet metal from Home gone to pot or Highes not so much for real commercial R panels
The key is getting it done. The score and tear works. But I don't like the finish left behind as much. Like you said, Depends on the gage of the material you have at hand. I've used shears, aviation snips. Knife like you, although I just bent it up and down until there's metal fatigue and you have a cut.

Home Despot is up here in Canada to, Lowes as well. Been through Texas in the early 80's when there was record cold that winter. But don't remember Highes. I'll look it up.