The basic Idea seems to be to try to keep from dying or being injured when all the snow and ice comes off your roof at once and buries or injures people when it all comes down at once.
I had a friend in Mt. Shasta during the 1970s who walked out his door and he had an aluminum roof with no snow guards on it. So, when he went out his front door and slammed the door 7 to 8 feet of snow buried him alive in his front yard. A neighbor heard muffled screams from inside the snow and went to see what it was an rescued my neighbor so he didn't suffocate.
But, if you get around 12 feet of snow you don't want snow guards (spikes) on your roof to stop the snow because with 12 feet of snow roofs will collapse often. And in 1992 when this happened in Mt. Shasta people were taking their snow blowers up on their roofs (probably not the best idea they ever had) and blowing the snow off their roofs this way. Unfortunately some people fall off their roofs and are injured or frostbite or even suffocate in the snow along with their snow blowers. So, all these things must be considered where you get a lot of snow.
However, because of global Climate changes it usually doesn't do this almost anywhere now but Canada and Alaska or Siberia or some place like that these days as people have to move further and further north as the southern part of our nation becomes too hot to live in for most people year around.
This likely is the main reason why Trump wants Canada (because of Global Warming and Global climate changes.
I built in 1980 an A-Frame which can shed over 12 feet of snow or more without any problems when I was there or not. I built it at 4000 feet in the forest with a view of Mt. Shasta from my land then. However, 7 feet of snow at one time (especially in January or February was pretty normal still in the 1980s.
However, this wasn't as normal in the 2000s to the 2020s even though one friend who recently passed away who had 2 1/2 acres near my land still had 12 feet of snow until April or May and I believe it was 2022 when this happened when we broke most of our records for rain and snow fall that year almost everywhere in California.
begin quotes regarding snow guards in Austria:
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