The problem with applying typical span tables to pergola construction is that with a floor or a roof, the members are acting as part of a system. So in short, can I span 12-13' between the posts using a couple 2x8s for each beam? And can the rafters span 12-13' if they're 2圆s? And would it be possible doing without angle/knee braces if I use some heavy-ish 90-brackets between post/beam and beam-rafter? Lag bolts to connect.ġ4' 2圆 rafters running parallel to deck boards (for a ~12-13 ft span) spaced ~24" oc (I understand this won't be to code, but I'm not loading things up top) Am initially thinking of the following (all pressure treated pine):ġ0' 6圆 posts, notched on each side to accept 2x8 beams (running a ~12-13 ft span perpendicular to decking). I'd also really like to pull this off without having to use angle/knee braces. There will also be no wisterias anywhere near this thing - no major loads aside from the pergola itself and some string lights. Really wanting a similar style to the following photo (except mine will be freestanding on 4 posts):Ī few important issues to note: this is in San Antonio, Texas, so there's no snow to consider. Looking to build a roughly 14' wide (side to side on pic) and 14' deep (back to front, or grass to house) pergola. The table is based on the following conditions and loads: building width, 32 feet wall height, 9 feet basement wall height, 8 feet dead loads, 15 psf roof and ceiling assembly, 10 psf floor assembly, 12 psf wall assembly live loads, roof and ground snow loads as listed, 40 psf first floor, 30 psf second and third floors.This is my back deck.Where the building width perpendicular to the wall footing is less than 32 feet, a 2-inch decrease in footing width and 1-inch decrease in footing depth is permitted for every 4 feet of decrease in building width provided that the minimum width is 12 inches and minimum depth is 6 inches.Footing sizes are calculated assuming a clear span roof/ceiling assembly and an interior bearing wall or beam at each floor. The table is based on the following conditions and loads: building width, 32 feet wall height, 9 feet basement wall height, 8 feet dead loads, 15 psf roof and ceiling assembly, 10 psf floor assembly, 12 psf wall assembly live loads, roof and ground snow loads as listed, 40 psf first floor, 30 psf second and third floors. Where the building width perpendicular to the wall footing is less than 32 feet, a 2-inch decrease in footing width and 1-inch decrease in footing depth is permitted for every 4 feet of decrease in building width provided that the minimum width is 12 inches and minimum depth is 6 inches.Where the building width perpendicular to the wall footing is greater than 32 feet, the footing width shall be increased by 2 inches and footing depth shall be increased by 1 inch for every 4 feet of increase in building width.The table is based on the following conditions and loads: building width, 32 feet wall height, 9 feet basement wall height, 8 feet dead loads, 15 psf roof and ceiling assembly, 10 psf floor assembly, 12 psf wall assembly live loads, roof and ground snow loads as listed, 40 psf first floor, 30 psf second and third floors.Linear interpolation of footing width is permitted between the soil bearing pressures in the table.
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