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Old 10-09-2007, 09:46 AM   #1
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Pergola Question


OK, I am building a pergola with pressure treated wood.

My demensions are as follows. 12' high x 24' wide x 18' deep.

I was going to use (4) 6'x6' posts and 2"x10" as the top parts. But what i have found out is i can only get Pressure treated 2"x10" in 16' lengths.

So if i had (4) more 6"x6" how would be the best way to join the 2"x10" together to make the spans?

See my picture and you will understand better (hopefully).
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Old 10-09-2007, 10:31 AM   #2
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What do you propose to do for lateral stability? - You cant just bolt it to a slab with those dimensions.

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Old 10-09-2007, 10:55 AM   #3
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What do you propose to do for lateral stability? - You cant just bolt it to a slab with those dimensions.

I was going to use the curved arches for the support.
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Old 10-09-2007, 12:57 PM   #4
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Pergola Question


Just notch & lag them into that Center post.
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Old 10-09-2007, 01:09 PM   #5
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Could you let us know how much it cost you for this structure... we require to do somthing similar to cover ourseleves from the western sun next year.... just want to have a rough idea when it's our turn.... if you can even let us know your construction plan... it is greately appreciated....
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Old 10-09-2007, 01:15 PM   #6
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Why are you choosing PT wood for this? Is it cost prohibitive for your project to be done in Redwood or Cedar or something that looks nice? Will this be painted?
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Old 10-09-2007, 01:20 PM   #7
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Why are you choosing PT wood for this? Is it cost prohibitive for your project to be done in Redwood or Cedar or something that looks nice? Will this be painted?

I was planning on painting it thats is why i choose Pressure Treated. Have you have any bad or good experiences with Painting the wood?
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Old 10-09-2007, 01:21 PM   #8
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Could you let us know how much it cost you for this structure... we require to do somthing similar to cover ourseleves from the western sun next year.... just want to have a rough idea when it's our turn.... if you can even let us know your construction plan... it is greately appreciated....

I will definietly post my plans and the actual costs after i am done with it.

So far with pressure treated wood i have come up with about $1200 worth of materials.
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Old 10-09-2007, 01:21 PM   #9
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Just notch & lag them into that Center post.

Can you be more specific about the notching??
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Old 10-09-2007, 02:16 PM   #10
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Cut away 1.5" from the top 11.5" of the center post. Then butt the two 2x12s end to end, and lag screw each into the post. They'll be resting on the notch you've created on the post.

Or for more strength, you could rabbet the end of each 2x12, so they overlap for a foot or so, and screw them together. Then rest them on the rabbeted post as described above.

Regarding painting PT, my understanding is that it needs to fully dry out before it will take paint. So let it age a year, then paint it.

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