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Tractor Talk Discussion Forum

O/T Snow load on roofs of driving sheds

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frankiee

02-08-2007 16:17:06




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O/T some what.
A general discussion group focusing on any theme related to tractors.
How about the building that the tractors are in.
Question: Snow load
Is there a general footage amount when to remove the snow?
With a roof rake, are there areas to concentrate on?
I did a building today and did about 10 feet along the length of the garage.
On another structure I did where the car port was.It was about a 14 ft. opening.
I know that there is no real answer to when to take snow off but from past experience, how much is too much.

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cadet trooper

02-08-2007 17:11:39




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 Re: O/T Snow load on roofs of driving sheds in reply to frankiee, 02-08-2007 16:17:06  
If it wasn't for snow you could use an 1/8" per foot fall but because of snow you have to build structure roof designs many times stronger according to building codes. Snow buildup is a major problem especially in drifting areas i.e. addons with higher roof lines. Our plant archeticual engineer said snow load is the reason we have bar joists in the north the way we do way over built 265 days of the year. CT

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RWK in WI

02-08-2007 16:33:57




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 Re: O/T Snow load on roofs of driving sheds in reply to frankiee, 02-08-2007 16:17:06  
Having delt with snow in Northern Wisconsin - Lake Superior snow belt for over 50 years here is some of the things I have found.
The actural depth of the snow is of little importance, it is the kind of snow that makes up the depths. Heavy wet snows are more troublesome than dry powdery snows. Removing the snow near the edge of a roof lessens the formation of ice dams and the rewulting leaks, but the weight of snow nearer the ridge on non truss roofs is more likely to crack rafters.
The real danger in deep snow is not the snow but what happens when the weather warms up. If or when you get a heavy wet snow or even worse a rain the snow acts as a sponge and holds this liquid adding to the weight, this is what collapses roofs.
I hope this helps you.

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Ken Macfarlane

02-09-2007 07:48:56




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 Re: O/T Snow load on roofs of driving sheds in reply to RWK in WI, 02-08-2007 16:33:57  
Newer buildings are designed for a certain snow load usually available from the local inspector. My place is designed for 45 lbs/
ft2 because I've got a steeply sloped steel roof. The local ground snow load is about 55 lb/ft2. These numbers include rain fall and cover 99% of the winters in the last 100 years or something like that.



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