Then click on the second link, which is for a Uniformly Loaded Simple Beam (the URL is at ). If you scroll down there you will find Don P's Calculators and you want to select the Beam and Column Calculators link. There are some really useful calculators at Forestry Forum at. So my rafter will be supporting a load of 30 s.f. You can calculate out what that is, but a convenient number to use is 10 lbs per s.f. The load includes the design weight for snow plus the weight of the roof itself. So each rafter is supporting an area of 3' * 10' or 30 s.f. That is the rafter spacing times the horizontal distance between the beams. The math part is figuring out the area and load each rafter will be supporting. I'm using big rafters widely spaced, shooting for 36" on center. The next part is pretty easy, and just requires some basic math. area for ground snow load, but applying wind and importance factors knocks it down to 50 psf. My location doesn't have a permit or inspector to worry about, so I'm just concerned about a roof that will withstand the elements, primarily snow. I'm considering the same question for a sawmill shed I plan on building. a 3-12 roof is the lowest slope you can go with metal roof panels. I used ABC panels to do my roof (Curtis Lumber carries them), and their installation guide would give you the spacing and sizing of the skip sheathing (purlins). They think they are going to get people building better houses but they end up getting the average guy to circumvent the code because it's so intimidating and potentially so expensive.Ī 50psf snow load 2圆 16" oc can span around 10 feet. these people that write these codes have probably never swung a hammer let alone built a house. There is no way they want everyone in upstate NY to hire some snow load case study specialist at $500 a job to do a case study before putting on a dang roof. Now it is a zoomed out map with most of NYS being blank, and written in the north east corner of Ohio, and in PA it says "CS" which means case studies. There was a zoomed in map of NYS in the 2010 codes and you could easily see what snow load to use. I was going to say it's easy to just look at the map.
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