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https://ozcobp.com/how-to-determine-pergola-rafter-spacing/
Since 16 goes evenly into 48 three times, you can arrive at the number you need to shrink your gap for symmetrical spacing across the pergola: three thirty-seconds of an inch or 3/32. So, the rafter spacing should be 15 inches and 29/32 of an inch for absolutely even spacing. The Only Hard and Fast Rule of …
https://www.pergolaplans4free.co.uk/pergola-beam-span.html
Here we have a very long pergola beam span of 20m. To shorten the span, install two additional posts to bring the centre distance to around a maximum of 10' (less if possible). So for this particular pergola we'd need to position posts at 5' in from the outside posts, giving the two 5' spaces and a …
https://plasticlumberyard.com/pergola-span-table/
Example: In a pergola application can a 2 x 8 x 8′ joist spaced 24″ on center support the load of 2 x 4 boards placed on top of the 2 x 8 spaced 12″ on center. The 2 x 4 boards weigh 2 lbs. / foot. The results in total loading on the 2 x 8 x 8′ span is rated 7 lbs. / foot and load is 4 lbs. / foot.
https://www.bobvila.com/posts/48300-pergola-beam-rafter-sizes-spans
I'm planning a cedar pergola over my deck. Posts will be 6"X6" and will be notched to accept a "sandwich" beam of two 2"X?"s. Across the beams, the rafters will be 2"X6"s on ~8" centers, which...
https://www.contractortalk.com/f50/beam-size-long-span-pergola-74623/
Mar 08, 2010 · Re: Beam Size For Long Span On Pergola I don't think 1/2" X 10 flitch plate will do the job on a 36' span ...it will bend. I never lost a cent on the jobs I didn't get!
https://forum.canadianwoodworking.com/forum/home-improvements/home-improvements-aa/37953-pergola-beam-span
Apr 05, 2012 · Re: Pergola beam span Your 2x10 joists will certainly support the 2x8s without an issue as there is no deck, therefore no surface load. The grapevines won't add anything appreciable to it.
https://diy.stackexchange.com/questions/66322/what-is-max-distance-between-posts-using-2x12x20-foot-beams-for-a-pergola
You can easily span 12' with a 2x12 for a pergola as long as your load is not crazy. What is going on top of the 2x12's? 2x2's? I would set my posts on 12' centers and cantilever 4' on each side. I would also sandwich a 2x12 on each side of the post. There actually is enough information in your question but there are many online beam span charts.
https://www.contractortalk.com/f50/pergola-joist-beam-sizing-help-97094/
Apr 22, 2011 · The local lumber yard is more familiar with structural aspects of homes and decks rather than pergolas. I know with less load you can use smaller members, but the span chart I have only shows ratings for cedar as deck joists, which is the same one the lumber yard has. Joists: unsupported span of 12'-5 1/2" with 2x2 cedar slats 5-1/2" o.c.
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