[milksnake12]

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.

Thank you for any help!

 

[Tom M]

Where are you from I can recommend a great contractor. His fees are fair.

 

[ScipioAfricanus]

I would go for tree fitty by tree fitty rafters.

 

[WBailey1041]

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

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[milksnake12]

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

Two 4x beams on 6x6 posts. Not on 12x posts.

 

[Seven-Delta-FortyOne]

Where do get these “1x4” rafters?

 

[milksnake12]

I just used cedar deck boards from Home Depot for another pergola.

 

[avenge]

This site is for .....nevermind please continue.

 

[Dirtywhiteboy]

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

 

[reggi]

I don’t get pergolas.

 

[Half-fast Eddie]

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

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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.

 

[WBailey1041]

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.

 

[milksnake12]

It was just the beam size I was looking for help with. It's a 14 ft span. 4x8 good enough or should I jump to 4x10?

 

[reggi]

It's a pergola. Just make it look good.

diychatroom.com

 

[milksnake12]

Yes, but I don't want that beam to sag.

 

[avenge]

Yes, but I don't want that beam to sag.

Support it with your 1x4 rafters every 12" then it will be a side pergola.

 

[Thom Paine]

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

 

[Seven-Delta-FortyOne]

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.

 

[rktect1]

Yes, but I don't want that beam to sag.

Make it even bigger then.

 

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