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 Post subject: Beam size for a pergola
PostPosted: Thu Jul 26, 2018 12:29 pm 
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Hi, I'm new to the forum and would be grateful for advice on whether my planned use of a 150 x 50 sawn oak beam will be sufficient to span 12' between 125 x 125 posts.
The pergola will be triangular with the three beams notched into the three posts. The 12' span is the longest (the other two being about 9') and will have corner braces at each end, thereby reducing the unsupported span to around 8'. I intend the rafters on top to be 100 x 50 and spaced at 16".
I didn't want to make the structure look too 'heavy' but are these sizes of oak posts and beams sufficient to prevent sagging?
Many thanks for your help.
Sim


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PostPosted: Thu Jul 26, 2018 2:03 pm 
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Way back in 98, I built a pergola spanning a 12 foot patio using the same size timber (pressure treated), and it was still standing securely when I sold the house in 2011. So, it worked for me.

Colin


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PostPosted: Thu Jul 26, 2018 2:10 pm 
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Thanks Colin,
I was hopeful that my timber sizes would be adequate and long lasting, particularly in oak hardwood.
Sim


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PostPosted: Thu Jul 26, 2018 6:11 pm 
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rule of thumb for spans is measure it in feet. divide by 2 then add 2. however what you are proposing i dont see a problem at all


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PostPosted: Fri Jul 27, 2018 8:21 am 
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My first house had smaller five inch softwood beams on the bedroom floors spanning 12 ft so I would be more than happy with six inch oak on a pergola.


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PostPosted: Fri Jul 27, 2018 12:52 pm 
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Thanks all for your comments. I feel confident about the sizes now and ready to get on with it.


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