Beam span table lvl2/28/2024 ![]() The first figure “2” remains constant, you just need to add “2” in the next figure. Similarly, for 2×6 rafter, the recommended size of ridge beam is 2×8, and so on. For 2×4 rafter, you should use 2×6 size ridge beam. Ridge beam sizeįor rafters of size 2×4, 2×6, 2×8, and 2×10 you need to use different ridge beam sizes. Ridge beam is used when roof slope is less than 3 in 12 Ridge boards are used when roofs slopes between 3 in 12 upto 12 in 12. It is jointed at the ends with a post or support There’s no support or post at the ends. It doesn’t take any loading or is not designed for any loadings. 2 It takes the load on the roof and on the rafters. It is a non-structural member that serves as a prop or support for opposing rafters to rest against and connect to. Ridge Beam Ridge Boards 1 It is a structural member that connects with the rafters at the ridge of the roof. Further the ridge boards must have a nominal thickness of at least 1 inch while the depth must be more than the cut end of the rafter. As per the code, you can use ridge board only if the slope is from 3 in 12 to 12 in 12. Unlike ridge beam, ridge board is a non-structural member that just acts a guide for opposing rafters to rest against and connect to. So, for the connection between rafter and attic floor bolting is considered instead of nailing.Īlso Read: What is a flitch Beam? – Purpose – Benefits – Thickness (Know ALL) What’s the difference between Ridge boards Vs. When a roof has a low-slope, it can result in high outward thrust force at low end of rafter.In case the attic floor joists are perpendicular to rafters, structural ridge beam is necessary to provide resistance against outward thrust force.A collar tie with height more than one-third of the ridge height will always need a high-end support. Also if rafter ties or collar ties may not provide enough support to roofs that has longer span.The top plate along exterior support walls won’t offer enough resistance so, high-end support on rafters is considered. That’s because such a roof doesn’t have enough resistance against outward thrust force along low end of rafters. ![]()
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