As I've mentioned before, the snow gets deep around here. The roofs around here that survive long enough to be old tent to be metal and steep. This allows snow to slide off instead of piling up deep. This puts ant vent pipes that go through the roof at risk. To the left here you see a deflector I put up a decade ago. It's just a piece of metal roofing bent into a wedge and hooked down with roofing screws. When the snow piles up and then slowly slides off, this splits the snow and saves the pipe.
My dad went for a stronger defector. This one is 2 years old. It's not as sharp, but is made of rebar and 1/8 inch steel and bolted to the roof with three large lag bolts.
A few feet away on my roof is another pipe a little lower on the roof. The sheet metal wedge on this one has been ripped off twice. I'm going to re-route this pipe out the end wall and patch the hole.
Last year the snow came down very light and collected four feet deep on the parents' house. It then rained and reduced that snow to about 2 feet. then the whole works came off in one shot in one night. This deflector was just a few feet away from the other one and just a little lower on the roof. It didn't completely tear it off, but it did bent it up good. These are the forces I have to design around.
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