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roof rafters
We live in northern Vermont with a lot of snow in the winter.We are building a 14x20 sugar house with a 12/12 pitch and metal roof.can I get away with 2x6 rafter and collar ties? I'm sure the snow would slide off with a steep pitch
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roof rafters
With a 12/12 pitch roof the 2x6's should be plenty strong, especially if your rafters will go along the 14' (short) direction. For a normal gable roof the 7' rise and 7' run will require only 10' rafters (plus any overhang you need).
Are my assumptions correct or are you planning a shed type roof or other orientation?
Sounds like a fun project.
Dave
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roof rafters
We don't generally get what you might call a LOT of snow, but we have had a couple of feet on our 12/12 pitch roof with fiberglass shingles and it does not just slide off. Are you sure 12/12 is steep enough? Maybe the metal roof is slippery enough that it won't be a problem, or a thicker snowfall would slide off but I've never seen it slide off here.
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roof rafters
The 12/12 with a steel roof will be plenty, Soon as you get about a foot of snow on top it will side off like butter on a hot ear of corn! Then once you start boiling and heat that roof up a couple of inches will also slide!
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roof rafters
16/12 is the recommended pitch for shedding accumulated snow. That doesn't mean it won't slide off a 12/12. It depends on the density of the snow that falls.
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roof rafters
2x6 is plenty with that span. Throw a couple of collar ties in on every other rafter and it will never move or sag
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roof rafters
I agree with you, but with it only being 20' long why not go to atleast 2x8? The added cost is nothing compared to the storm of the century that will come after you build?
The more room for insulation down the road the better.
I would figure it out (cost wise) and procede from there. Personelly, if adding $200 to the cost will be a problem, I would wait. The roof is one of the first things you see when looking at your place. my .02
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roof rafters
I wouldn't count on the snow sliding off. You might check but I don't imagine that snow-loading codes assume it's going to slide off either.
We have an unheated screen porch at our camp that has a steel roof and 2x6 rafters. It has a minimum pitch for steel roofs without going to low angle roofing. I don't know how that compares to a 12/12. I can say that the snow doesn't necessarily slide off and I rake it several times a winter. I think what happens is that the air on the inside of the porch melts the snow a bit on warm days. If the snow then doesn't slide off then it freezes to the roof. If that happens then it has to wait for an even warmer day and support any additional snow as well--good chance that making sugar would cause it to slide off with a little encourgagement from a rake though.
We have an old 'lean-to' type sugar shed a little larger than that which has stood more than 50-years with 'real 2x4's' for rafters. The walls were getting a bit splayed and the roof sway-backed though. I did some probably over-designed remedial work and it has been fine.
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