Please enter your login/password details before posting a message, or register here first. That is one of the handiest online tools. I do know where to look for a lot of them though. Thanks guys looks like i will use 2 x 10sīorrego, I don't have all the answers. MtnDon - I must say, you are the man! An answer for everything! We can always count on you :-) Cheers! Switching to 19.2 inch spacing will work with SP. Purling is the structural members that span between rafters or trusses used to attach and support metal roof coverings and transfer the roof loads to the. Southern pine almost makes it in grade#2. In this guide, we’ll explain rafter spacing, code requirements, roof rafter span tables, and rafter spacing calculators. If you’re within the recommended span for 2×6 lumber, they should be strong enough for a shed roof. Is 2×6 strong enough for roof rafters 2×6 rafters can be used for shorter spans and less demanding loads. It appears that it will be difficult to reach 16 feet with most common species. For a shed roof, common sizes are 2×6, 2×8, or 2×10, depending on the span, load, and desired roof pitch. ![]() If ya'll already knew all that please don't be offended. Note the calculator provides the minimum amount that must rest on the supports. Rafter span is generally one half the distance between the wall tops minus the thickness of the ridge board.įloor and ceiling joist spans are also measured inside their supports. Span is also measured from the inside edge of the support, not the outside edges. Span for rafters is measured along the horizontal distance, not the slope. That info can also be found in the IRC code books for many areas. The county building dept is often the best source for snow load info. That is also a good idea if one is not certain about snow loads. If near the maximum and if a solid floor is wanted it is best to go up a size, choose a better grade or reduce the spacing. The two-by-4 rafters are the most common size used on roofs. The maximum span for roof rafters can be determined by the lumber size, species/grade, and spacing used. In fact, most residential buildings have purlins that are three to four feet apart. # Posted: 9 Feb 2011 22:13 - Edited by: MtnDon The average spacing of a metal roof’s purlin is four to six feet. ![]() * Attic floors with limited storage L/240 & 10 psf. * Bedrooms and habitable attic floors L/360 & 30 psf The deflection limit may need some explanation for those not familiar with it.Įxamples of code-prescribed deflection limits and live load values are: Note there is a second version called "span options." click on the bar near the lower area of the screen. Maximum span for any given size rafter or floor joist depends on species and lumber grade as well as spacing and what the load is. Small Cabin Forum / Cabin Construction / max span on 2 x 8s for roofĪdding on too the shack using 2 x 8 on 24" centers wondering what kind of distance i can get? we are in the south so no real snow load to deal with will have osb board and then metal roofing.just trying to get about 16 feet total. Forums - Register/Sign Up - Reply - Search - Statistics.
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