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Old 04-16-2012, 03:01 PM   #1
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how long to make beams


I would like to build a pergola using 26' x 2" x 12" for the main structure that would bolt to 8" x 8" coming out of concrete or bolted to the concrete. I would like to park two autos under it without a support beam in the center.

I built a peaked roof using 18' beam spans several years ago in a high wind area and it is holding up very well.

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Old 04-16-2012, 04:13 PM   #2
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Originally Posted by selfmade
I would like to build a pergola using 26' x 2" x 12" for the main structure that would bolt to 8" x 8" coming out of concrete or bolted to the concrete. I would like to park two autos under it without a support beam in the center.

I built a peaked roof using 18' beam spans several years ago in a high wind area and it is holding up very well.
Your not spanning 26' with 2-2x12s.

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Old 04-16-2012, 04:17 PM   #3
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how long to make beams


It's gonna sag!
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Old 04-16-2012, 04:36 PM   #4
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how long to make beams


I'd look into using glulams.
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Old 04-16-2012, 05:42 PM   #5
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how long to make beams


Hmmm, not sure it is a pergola so no real roof load but it's own weight.
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Old 04-16-2012, 05:59 PM   #6
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Hmmm, not sure it is a pergola so no real roof load but it's own weight.
A pergola's beams definitely have a load--the weight of the rafters.
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Old 04-16-2012, 07:47 PM   #7
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Originally Posted by selfmade
I would like to build a pergola using 26' x 2" x 12" for the main structure that would bolt to 8" x 8" coming out of concrete or bolted to the concrete. I would like to park two autos under it without a support beam in the center.

I built a peaked roof using 18' beam spans several years ago in a high wind area and it is holding up very well.
How many 2x8s are you putting because if u put at least 3 or 4 it should be ok with the span
1 suggestion u can take into consideration is to put 1 on each end roughly 4' in and 1 in the middle that's how I did mine but the only diff. Is mine is 36' n I have a 6x6 every 7'
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Old 04-16-2012, 08:12 PM   #8
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How many 2x8s are you putting because if u put at least 3 or 4 it should be ok with the span
1 suggestion u can take into consideration is to put 1 on each end roughly 4' in and 1 in the middle that's how I did mine but the only diff. Is mine is 36' n I have a 6x6 every 7'
Read his first post again. 26' no post in the middle..
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Old 04-16-2012, 08:22 PM   #9
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Building a pergola to park autos in?
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Old 04-16-2012, 09:00 PM   #10
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Read his first post again. 26' no post in the middle..
Well in that case you have a few options you can either beef it up with 3 or 4 2x12s or use LVL (laminated venire lumber) it's just as strong as 2 2x12 I think I can't remember but it is very strong and won't sag as easly
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Old 04-16-2012, 09:50 PM   #11
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Originally Posted by ninjahero

Well in that case you have a few options you can either beef it up with 3 or 4 2x12s or use LVL (laminated venire lumber) it's just as strong as 2 2x12 I think I can't remember but it is very strong and won't sag as easly
In other words ....your guessing....very dangerous post you've made and should not be listened too.
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Old 04-16-2012, 10:01 PM   #12
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In other words ....your guessing....very dangerous post you've made and should not be listened too.
No actually I'm not if u no war ur doing n do it properly u will have no safety issues
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Old 04-17-2012, 07:20 AM   #13
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I think your hardest issue will be getting a 26' 2x12. You can special order them but its not something your local big box lumber yard will carry. I suspect you will end up using LVL at the span you want. Go ask the guy at the lumber desk since you have to order it anyway. They have software that will tell exactly what you need and they will give you a quote for nothing.

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