![]() What size is a pergola main beam? The size of a pergola main beam can vary depending on the design and load-bearing requirements, but common sizes are 4×6, 6×6, or even 8×8 inches. Additionally, local climate and environmental factors can impact the longevity of the wood used in the beams. Please note that these spans are general guidelines, and it’s essential to consult with a structural engineer or local building codes for precise calculations and to ensure the pergola’s structural integrity and safety. ![]() Keep in mind that these are approximate spans, and the actual span may vary depending on factors such as the wood’s grade, load, and local building codes. 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.Here’s a table summarizing typical pergola beam spans for various beam sizes and wood species. 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. ![]()
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