My New shop, a typical metal roofed pole barn is only a few years old. The first winter i did not have snow guards, when the snow slid off the roof, and it came off in one slide,like a avalanche the heavy wet snow compacted when it fell off the 12 foot high end and i coulndt even plow it,6 feet deep and it compacted so hard my plow rode over the top of it!. I knew that was going to be a problem. I'm in upstate NY, we get a good amount of snow. So last year I put up snow guards mostly over the doors as i also wanted to have the snow slide off, just not where the doors are! It worked pretty good, we a tremendous amount of snow last year,
The snow guards did there job, none broke, it allowed the snow to slide off, and would melt off eventually where the guards were.
I did not have permanent heat yet last winter but i did have a stack for a future heater. well the snow did take that down last year, so this summer i made and installed a uhh, snow cutter, i guess.. i look alum diamond plate about 12"w x 6 feet long and mounted it to some alum angle, and screwed it up there in a V or wedge shape past the stack, my theory is when the snow slides it will cut it and divert is past the stack

Its almost January and we got no snow! the jurys still out on that one..
last year