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Old 04-02-2009, 12:09 PM   #1
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Pergola framing question


Hello. New to the board. I had a question in regard to my "planning" steps on building a Pergola. It will be 10'x16'. I plan on using 4-4"x6" posts (only the corners). I plan on using 2-2"x10"x16' for the 16' span (i.e., beams) that will be bolted to the posts (I would also use 2-2"x10"x10' for the 10 foot span - bolted to the posts). I was thinking about placing a 2"x8"x10' or 2"x10"x10' in the middle of the 16' span (cross-ways), attached to the 2"x10"x16' beams. This would help with any deflection with the rafters, which will be (2"x4"x16's). My question is, will I have a deflection problem with the 2"x10"s for the 16 foot span (i.e., will they deflect)? As you can tell, there won't be a "heavy" load on the beams. Any input is appreciated. Thanks.

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Old 04-02-2009, 01:04 PM   #2
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Pergola framing question


you should be okay. You will see ceiling joist that are spanned 12' using 2 X 8 and must have a higher live and dead loads on them.


Last edited by Bob Mariani; 04-02-2009 at 01:06 PM.
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Old 04-02-2009, 01:38 PM   #3
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Pergola framing question


Thanks Bob. I may double-up on the 2"x10"x16s beams with each post sandwiched between the beams.
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Old 04-03-2009, 06:39 AM   #4
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Pergola framing question


There is no live load on a pergola and very little dead load for that matter. If you span more than about 8 feet with 2x4s, you need to plan on something to stabilize them. Otherwise they will twist and warp
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