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Thread: Pergola Design - Beams
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27th June 2014, 02:48 PM #1New Member
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Pergola Design - Beams
I'm building a cedar pergola with 6x6 post, 2x12 beams sanwiched on each side the the posts, and 2x8 joists across the beams.
The overall size is 25' x 14'. The post on the long 25' side are 22' apart with a post in the middle.
The longest 2x12 beams I can get are 20', so I will have to use 2 2x12's to reach across the 3 post but I dont think its a good idea to butt joint the 2x12's together on the sides of the middle 6x6 post. So I thought of this concept shown in the sketch to have seperate levels so I could get a good solid attachment for each 2x12 beam to the posts with bolts.
Does this sound like a good worthwhile idea or is butting 2x12's on the side of a single 6x6 post acceptable?
pergolaE.jpg
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27th June 2014, 08:14 PM #2Senior Member
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http://www.designrulz.com/design/201...aceful-refuge/
these pics show similar design to yours. One thing that I see different to your design is the addition of cleats to help support the beam. Or a different approach is to add supporting angle braces to support the beams. The beam sizing seems ok for span width on the tables I googled.
anyhow I am no expert but I thought I would give you an opinion of how to better your design.
cheers
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28th June 2014, 01:15 AM #3
Sorry, but my immediate response to your design is YUK
Google "scarf joint" -- it's the proper way to achieve the spans you want. In your case the inside joint would one side of the post, the outside joint the other.
also, if the effective span is only about 12 feet, do you need 12 x 2s, or would a smaller section (say 10 x 2) be sufficient?regards from Alberta, Canada
ian
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28th June 2014, 09:40 PM #4GOLD MEMBER
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Gee you Americans have it tough - 2 x 12 Western Red Cedar for a pergola! We in Australia should be so lucky. Then again I guess we have access to some pretty good hardwoods.
I think the design looks a little odd. If you have to have the structure 25' long you are committed to using 2 beams anyway, so a scarf joint on the centre post looks like the way to go to me too. (Stupid computer trying to tell me I spelt 'centre' wrong - no doubt you would agree?)
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30th June 2014, 02:56 PM #5New Member
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Scarf Joint
Ian,
I've researched Scarf Joints, but didn't find much information on scarf'ing 2x's.
Attaching updated sketchup drawing using scarf joint on the 2x12's over the center post.
Is this the correct scarf joint pattern for 2x's?
Is glue used in the joint?
Should the joint be located saddled on side of the post with bolts going through the joint and post?
Thanks
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30th June 2014, 02:59 PM #6New Member
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Drawings
Forgot to attach drawings.. here they are
pergolaF1.jpgpergolaF2.jpg
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30th June 2014, 07:39 PM #7
That would be ok
or you could do something like this:
Scarf_joints_(PSF).pngscarf2.gifScarfJoint.jpgf212.jpg
Yes, bolt through the joint.
TM
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1st July 2014, 01:31 AM #8
Thanks for posting those Termi
another version uses pegs to hold the joint together
there's lots of variations
here is a reference http://www.basiccarpentrytechniques....oints%207.html
in your case -- using paired 12 x 2s, one joint could be about 2ft to the right of the centre post, the other about 2ft to the left of the post. sort of like this
or the joint could be over the post like this
regards from Alberta, Canada
ian
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1st July 2014, 11:30 AM #9
Pergola framing
The scarf joint looks very classy.
I'd recommend that the beams sit on top of the posts.
You can butt or lap the two beams on top of the posts if you want something simpler.
I used wooden pegs to hold my joints together but a big steel plate would also work.
No glue.
Knee braces would add stability to the frame.
I used mortice and tens with pegs but they could be bolted on.
Notch the joists and or beam to help keep them in place. Metal brackets are available if you want to go that way.Scally
__________________________________________
The ark was built by an amateur
the titanic was built by professionals
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1st July 2014, 08:37 PM #10
Note to Jak
check out your local building code regarding what bracing you might need to add to your pergola frame.regards from Alberta, Canada
ian
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7th July 2014, 01:33 PM #11New Member
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New Pergola Design
After lots of research, the design has changed.
The beams are now 2x8's, running perpendicular from the house. The span between the post with the double 2x8 beams are longer (13') than the other direction (11'), so figure the larger boards should span the longer distance.
The joists are still 2x6 and now spanning the shorter distance of 11'. Separate 2x6 boards meet at the center post, butted together. Those meeting at the post are bolted thru the 6x6 post. This forms some support to racking, but I do plan on adding knee braces (not shown yet).
All 6 posts are attached to concrete using Simpson ABA66RZ metal post bases.
Appreciate any feedback on this latest Pergola design.
pergolaH1.jpgpergolaH2.jpgpergolaH3.jpg
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