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Discussion Starter · #1 ·
Hello!
Having trouble determining the correct beam size for a pergola. It's attached to the house with two beams running out to 6x6 posts. They'll be 20 feet long with a 14-foot span. I'll throw some 1x4 rafters on top. Would I be looking at 4x8 or 4x10 for that distance? I tried using beam calculators but they all assumed a different application with some load.

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Thank you for any help!
 

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Honolulu, Hawaii
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6X6 post to hold up 1X4 rafters? I have never heard of a 1X4 rafter,, can I get a pic of that.
 

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A pergola with 4x (four by) ceiling? 12x posts? How wealthy are you?

My Sis-in-law has a similar pergola, bought from Costco i think. It’s actually pretty sturdy, well drsigned. All pre-cut pieces that fit together well.
 

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I don’t get pergolas.
You install it on your deck so that when it’s time to have the gutters replaced the contractor can take half of it apart without any instructions and charge you five times more.

I like to screw a big thick sheet of plywood to it with a 2 x 4 running along the back to stop the ladder from sliding.
 

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Relentless
Space Mining
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It's a pergola. Just make it look good.

diychatroom.com
 

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Hello!
Having trouble determining the correct beam size for a pergola. It's attached to the house with two beams running out to 6x6 posts. They'll be 20 feet long with a 14-foot span. I'll throw some 1x4 rafters on top. Would I be looking at 4x8 or 4x10 for that distance? I tried using beam calculators but they all assumed a different application with some load.

View attachment 530878

Thank you for any help!

You need far more help than you realize...
try:
DIY Home Improvement Forum
 

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Goin' Down in Flames....
Highwayman
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None (most) of us here are not interested in assisting DIYers.

This is a pros only site, for professionals to discuss construction with their peers.

Diyers are not permitted to post here.

And we don’t do structural calcs over the internet anyway.
 

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Capra Aegagrus
Remodeler
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Thanks for posting on ContractorTalk.com. The Moderators of this forum would prefer that you post Homeowner and/or Do It Yourself related topics on our sister site www.DIYChatroom.com

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