Posted by IOWA NORTHEAST on December 23, 2010 at 19:36:28 from (206.72.18.89):
In Reply to: OT snow on house roof posted by 55 50 Ron on December 23, 2010 at 18:43:50:
I got a call yeasterday afternoon, from a good customer. One shed every truss is busted, another shed one rafter busted. We got the snow off them and a couple others, now we are gambeling on the rest in hopes of warm weather.
We use 8 HP walk behind blowers with rubber tracks, you can control the depth much better that one with wheels. On metal roofs, you give it some dings once in a while, but the effort it saves seems to over play any harm done.
One building was built 1962, the other 1972, and he has never shoveled snow off before. The deepest was a touch over 3 ft, the rest averaged 22 inches, but it had gotten a freezing rain on them after the snow.
A coment was made that rafter spacing is 16 inches on center compared to 8 ft on center on a pole building. Please don't think for a second that they are the same rafters, some are made for 20 ft spacings, others are 12 inches on center--that doesn't mean the roof will hold the load. The design, and engeneering is totaly the same principle, but the larger the spacing, the stronger the rafter, do the math.
As said, houses are intended to have a safer load usualy, and comercial is far higher than a ag building.
As long as you don't tear up the shingles, you can get rid of alot of weight in one hour.
I have helped clean up many buildings that went down, and I will make it clear, that it isn't a job where the snow is one place, the lumber another, because it is mixed up real good.
I should add, that the building built in 1971 was a cattle shed, and no insulation. The exposure to high humidity at times, has taken it's toll on the plywood gussets.
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