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6/14/2025, 5:26:09 PM
>>2924077
They're not needed for asphalt shingles because the grit of the shingles prevents snow from sliding.
What causes "snow" sliding is melt water between it and the roof surface which allows the slab to hydroplane.down the slope
I use "snow" in quotation marks because in a high snowfall areas it's really a compacted slab of snow/ice like a glacier.
For this reason any smooth surface roof has dangerous snow slide problems. Aside from snow guards, the other solution is to design the roof with steep slopes which prevent the snow from accumulating and self-compacting in the first place.
In pic related the slab on the porch roof will slowly creep forward until it breaks under self weight which would crush anything below. If it were a little steeper like 4:12 to 6:12 the entire slab could suddenly slide off which is even more dangerous.
They're not needed for asphalt shingles because the grit of the shingles prevents snow from sliding.
What causes "snow" sliding is melt water between it and the roof surface which allows the slab to hydroplane.down the slope
I use "snow" in quotation marks because in a high snowfall areas it's really a compacted slab of snow/ice like a glacier.
For this reason any smooth surface roof has dangerous snow slide problems. Aside from snow guards, the other solution is to design the roof with steep slopes which prevent the snow from accumulating and self-compacting in the first place.
In pic related the slab on the porch roof will slowly creep forward until it breaks under self weight which would crush anything below. If it were a little steeper like 4:12 to 6:12 the entire slab could suddenly slide off which is even more dangerous.
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