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Homeowner Forum / Construction / October 2005Framing for shed
Hi all, I was working on a design for a 16x20ft shed. It will be basic light frame construction (SPF 2x6 walls, OSB sheathed, 12/12 pitch hip roof with asphault shingles). I would like to have more space for a second floor attic by using longer studs and balloon framing the second floor (and extending the exterior wall up a few feet more). This would give me extra space by not having to build a knee wall (i.e. the exterior wall would be about 3 or 4 feet above the second floor). If I collar-tie all the rafters and use a double 2x6 top plate, will it be enough to resists the push of the rafters against the exterior walls? Can you find straight enough 14-16ft 2x6 studs (non-engineered) to do this? Thanks, Budman In a previous post Budman wrote... > If I collar-tie all the rafters and use a double 2x6 top plate, will it > be enough to resists the push of the rafters against the exterior > walls? Can you find straight enough 14-16ft 2x6 studs (non-engineered) > to do this? The short answer is "maybe". The "push-out" problem depends a great deal on the magnitude of your snow load. Straight studs 14-16 feet long are possible but you will have to get them from a lumber yard and not one of the big box stores.  SignatureBob Morrison, PE, SE R L Morrison Engineering Co Structural & Civil Engineering Poulsbo WA >snip< Straight studs 14-16 feet long are > possible but you will have to get them from a lumber yard and not one of > the big box stores. [quoted text clipped - 4 lines] > Structural & Civil Engineering > Poulsbo WA Sometime last year, I made a great "discovery"... Our outstanding local lumberyard (Cascade Lumber) sells structural grades of 2x4 and 2x6 on a simple per foot basis. In other words, it costs me the same per foot whether I buy in 8ft lengths or 20ft lengths. The funny thing is when I sort through the piles, if anything the longer lengths tend to be straighter higher-grade material. For most purposes, I've pretty much taken to buying 20ft lengths and cutting them as required. They're a little harder to transport and store, but you end up with more options and a lot less waste. Richard Johnson PE Camano Island, WA In a previous post Rich-out-West wrote... > Our outstanding local lumberyard (Cascade Lumber) sells structural > grades of 2x4 and 2x6 on a simple per foot basis. In other words, it [quoted text clipped - 4 lines] > cutting them as required. They're a little harder to transport and > store, but you end up with more options and a lot less waste. Hey Rich: Where is Cascade Lumber? On the island or in Stanwood? SignatureBob Morrison, PE, SE R L Morrison Engineering Co Structural & Civil Engineering Poulsbo WA > In a previous post Rich-out-West wrote... > > Our outstanding local lumberyard (Cascade Lumber) sells structural [quoted text clipped - 15 lines] > Structural & Civil Engineering > Poulsbo WA Cascade Lumber is on the Island. Hamilton Lumber is the one in Stanwood proper. Cascade specializes in framing lumber, siding, etc. Their prices, service, and quality are outstanding and they deliver over quite a wide area. When I was interviewing framers, two of the best local guys told me they wouldn't even consider the job if I was getting my materials from anywhere else (due to lower quality of some of the other local sources). Cascade has been great to deal with through our whole project. Hamiliton is more of a general service hardware store/lumber yard. That being said, they fill a good niche in our town as well. Richard Johnson PE Camano Island, WA Snow load not really a problem here in central NC. Maybe I should just extend a gable off the front for a porch (for some headroom). Thanks for the info. Budman >> I was working on a design for a 16x20ft shed. >> SPF 2x6 walls, OSB sheathed, 12/12 pitch hip roof >> using longer studs and balloon framing the second floor >> the exterior wall would be about 3 or 4 feet above the second floor >> If I collar-tie all the rafters and use a double 2x6 top plate, >> will it be enough to resists the push of the rafters With 4 foot side walls, a 16 foot width, and a 12/12 pitch, locating collar ties at an 8' ceiling height would put them about 1/2 way up the rafters. I've always heard the limit was about 1/3 of the total height, but you will also have the balloon framed side walls resisting the outward thrust too. It sounds fine to me, but Bob would know better than I about the structural forces involved with heavier snow loads. > Straight studs 14-16 feet long are possible but you will have > to get them from a lumber yard and not one of the big box stores. While I got most of our lumber from the lumber yards, I did buy quite a few 16 foot 2x6's from our local Lowes. The longer lengths don't get picked over as much as the shorter lengths, and I found it quite easy to find nice straight boards. The biggest advantage of getting them at the lumber yard is that they'll deliver. It's not real easy to transport 16 foot boards... :) Anthony |
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