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Old 08-25-2008, 07:14 PM   #1
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Pergola


Im about to build a pergola over my existing patio and want to get some opinions. It will be 10'x12.5' with a 16" overhang on all four sides. I plan to use 6x6 posts (18" in the ground with concrete) and put double 2x10s running across the front and back and then put 2x8/10s across every 16".

Im concerned about the span and the joists being to big/small.

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Old 08-25-2008, 11:36 PM   #2
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Pergola


I've seen more 4x6 or even 4x8 used in my area. With 2x8 or 10's your more likely to see twisting. With 6x6 posts I'd go with at least 4x6's.

Good luck

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Old 08-26-2008, 02:52 PM   #3
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Pergola


The lumber sizes you quoted will easily span the distances. If you plan to use treated lumber then you need to plan on something to brace the joists. Otherwise they will definitely twist, bow, warp to the point of ruin. Plan on either blocking in between or purlins.
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Old 08-28-2008, 06:00 AM   #4
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Could I get by with smaller lumber? I want to to look beefy but not over powering. Also, as for the warping, could I place a few 1x2s across the top to solve this issue or will it need something else? Is so what?
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Old 08-28-2008, 06:21 AM   #5
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Pergola


With the sizes you have listed you could use smaller dimensional lumber. 2x8s or 2x6s will easily span that length since they are carrying no load. 1x2 purlins would work. I've seen them screwed on top or notched in. Your preference, and depending on how much work you want to do.
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Old 08-28-2008, 07:11 PM   #6
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Could I use and 2x6 to span the main length (12-13ft)? The other boards would go on top of those.
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Old 08-29-2008, 06:35 AM   #7
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I think 2x8 would be a better choice. It will probably stay a little straighter. It's not that you're carrying any great loads, but you don't want it to sag over time.

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