With this information, they can create a safe and secure roof structure that meets all local building codes. It also helps them select the appropriate type of lumber for the job and determine the proper fastening techniques for the rafters. This helps them ensure that the rafter span is adequate for the job and the load it will carry. The Tji roof rafter span table is a comprehensive collection of data that helps architects and engineers determine how far apart each rafter should be and how much wood needs to be used for the job. Secondly, the ceiling joists and end connections will require further consideration if thrust loads from a conventionally framed (rafter) roof system are present. Understanding a Tji roof rafter span table can help ensure that your roofing project meets local building codes and is structurally sound. 110 ¾ The maximum clear spans in Table 2 consider an axial tension load resulting from the thrust force 210 20 (0.131 x 2¼) due to the roof rafter being fastened to the ceiling or larger Clinched 230 joist. A Tji roof rafter span table is an essential part of any roof rafter design, as it provides the information needed to determine the maximum span of the rafters based on the load they are carrying and the type of lumber used. ![]() First world problems.When building a structure, it's important to understand the basics of roof rafters and the span tables associated with them. There's a 6 foot easement on that side to the fence, so the building wall will be reasonably close to the fence. OTOH, the north side where it will actually go did have the advantage that it could be closer to the "effective" line because the actual property line is about 7 feet into the neighboring property because of what had to be done when subdividing it years ago. It would be "logistically" and visually a lot better if it was on the south side rather than the north side but because of the required 15' side setback, a very large and mature willow tree would have to be destroyed. SWMBO is to not have the structure require removing any live trees. Positioning my own building has been an exercise because a "prime directive" for both myself and Professor Dr. Every property has its upsides and downsides. I'm sure that what you put up will meet the immediate need and you've mentioned that you do have a plan to move on in a few years to larger quarters. No way that would pass code now, but it's been there for 100 years and is still pretty straight. The funny thing i that the house is also 16 feet wide and has rough cut 2x4 rafters on 16" centers and a 12/12 pitch. ![]() If anyone knows of a rafter span table that goes up as high as 90# I would be very grateful to hear of it. ![]() It seems to me on a back of the envelope basis that full size 2x10 should be about right, but I am not an engineer. I think there is some extra strength in the full size rafters, too. It looks on the 70# chart like that would be okay, but I would need to go bigger for 90# presumably. They will be at 6/12 pitch, 24" centers and the span will be 8'9". I had specified full size rough cut 2x8 rafters on 24" centers. I would be happy to use whatever size rafters she told me to, but since neither of us knows what is sufficient I seem to be stuck unless I hire a structural engineer, which I would rather avoid if possible. The inspector also doesn't seem to know what size rafters are wanted. I can find rafter span charts for up to 70 psf, but nothing higher. The building inspector says that the roof must be designed for a 90 pound snow load. ![]() I have run into an obstacle in getting my workshop design approved.
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