Depending on all contributing factors though, 16” and 24” are commonly used for most buildings. Standard industry roof rafter spacing is 12”, 16”, 19.2”, and 24” on-center, however other spacing may be used by a Structural Engineer. Plus, you have to select the correct rafter spacing to span the distance based on all the factors that affect your design. You have to consider live, dead, wind, and snow loads, select the correct species, grade, and dimension of lumber for the rafter span, and decide if there will be a ceiling or loft supported by the rafters. That's it! □ If you want to check the other preliminary values we used in the calculations, like the beam's cross-sectional area, area moment of inertia, section modulus, adjustment factors, and others, you can view them by clicking on the Advanced mode button below our wood beam span calculator.Designing and building a roof for a shed, porch, cabin, garage, or home can be a daunting task. However, for our wood beam span calculator to work, you must enter either the required bending or shear stress values. If you want to use our tool to determine the recommended span of a beam, you can do that by skipping step 4. You can also expect the results for the allowable and required bending and shear stress values for comparison and the assessment of whether the selected beam size passed their respective tests. You'll also see a note if your wood beam passed the deflection test. Choose your desired deflection limit criteria.Īt this point, our wood beam span calculator will already display the deflection due to loading and the maximum allowable deflection of your beam.Type in the uniformly distributed load your beam needs to carry.If your preferred size is not on the list, you can use our tool in Advanced mode to enter the actual width and actual height of your preferred beam size. Pick the nominal beam size you want to test.Select lumber grade depending on what you want to use or what is available to you.
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