you can use 50 x228 (2x8) pine timber will work over that span. pergola does not carry any load. the trick is when using spans longer than 3.0m (10ft) is to brace the timber in some way that it will not twist with weather conditions. you can make a 38 x 38 screen over the top of the pergola. that will give some shade and will brace the timber.
you now have cut your span down to 8'. use 2 layer of 2" x8"s for the long beams (16' span), and also 2 layer 2" x8"s for the 12' span to keep in uniform. now come in 2' from the corners of the 12' sides, this will give you a span then of 8' here also. you can cover these corners with lattice and they will give the pergola a little privacy.
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3 2x10 beam span. april 12, 2018 - by how far can a deck beam span fine homebuilding. pergola main beams span building construction diy. cantilevers in the 2016 code professional deck builder. township of adjala tosorontio. the right and wrong way to splice beams family handyman. deck building span 2x6.
what is max distance between posts using 2x12x20 foot beams for a pergola. ask question asked give a definitive answer, but for decks, a rule of thumb is when supporting joists that span 12 feet, a double ply beam can span in feet a value equal to its depth in inches. pergola : can i use 4 - 6x6 post, with 2x10 beams sandwitching 6x6
the pergola may someday support vines. i've found some online span charts, but they don't really apply to pergolas, which carry so much less load than floor/ceiling framing. any help on the beam
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[quote=renovatr;]i am building myself a pergola. it will have 6x6 posts, 2x8 beams bolted to each side of the posts spanning approx. 17 ft. mac: i dont recall ever seeing where it says a single 2x8 can span 17'. the way the op stated it there would be a single 2x8 on each side of the 6x6 post. unless you know something more about this?????