Snow Load In Valley
Snow Load In Valley
(OP)
I was reviewing the ASCE and it does not provide loading guidelines for the snow load that builds up in the valley of roofs. How have people accounted for this load or is it not required?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Snow Load In Valley
I too, was surprised that the current ASCE 7 does not address this issue more specificily. Snow accumalates in valleys and may be a major design concern. One reason may be that the current unbalanced snow load provisions for gable roofs is much higher then what was required by some codes in the past. In practice I found, when a building only has a single valley on one side of the roof, the unbalanced snow ussually governs.
However if you have a building with valleys on both sides of the roof the snow in the valley may govern.
RE: Snow Load In Valley
Sorry for that...it's Friday... My ex-bank gave me a snow job today, so I'm gonna drift outa here.
Mike McCann
MMC Engineering
RE: Snow Load In Valley
On topic: Most codes don't give you complete guidance; And I hope they never try! They're already plenty thick enough, and as often mentioned, don't add much more utility in the added pages.
Personally I calculate snow based on slopped roof sliding and take 1.5 times the added effect above flat roof. Might not make sence for your code, but worked in OBC, NBCC and now in the NZBC - AS/NZS 1170.
Cheers,
YS
B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...
RE: Snow Load In Valley
On the serious side, we've been using 1.5 but sooner or later someone is going to start asking questions... That's all I've got, I'll shut up now.
RE: Snow Load In Valley
NBC 2005: Snow, Wind and Earthquake Load Design Criteria for Steel Building Systems
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It gives the same basic info as the Commentary, but with a couple of really good, worked examples.
RE: Snow Load In Valley