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Old 06-28-2018, 02:07 PM   #1
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Pergola Sway


Hi everyone, I have just built a pergola and it is almost complete, but I'm concerned with the amount of sway at the top.
The pergola is built with 4x8 posts and resting on 12x48in cement footings. The longest spans are 17 and 11 ft made with two more 4x8 beam. The cross pieces are 2x6 and the knee braces are 4x4s.
The sway is mostly when the pergola is pushed "sideways" (the short way) and it has very little sway the long way.
I get the nature of the design has a lone post far away from any others so it's difficult to brace but is there anything the can be done?
I have pictures attached.
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Pergola Sway-img_20180628_130439_01_1530209089864.jpg   Pergola Sway-img_20180628_130439_02_1530209103510.jpg   Pergola Sway-img_20180628_130433_01_1530209121514.jpg   Pergola Sway-1530209201777608255077069832563_1530209220023.jpg  
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Old 06-28-2018, 02:47 PM   #2
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Re: Pergola Sway


Taller post holders might have helped.
Any chance of another beam back to the house?
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Old 06-28-2018, 04:57 PM   #3
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Re: Pergola Sway


Instead of the angle brace just going to the top rafter on top of the beam another beam like I added to the picture secured between the beams front and back would offer better support for the knee brace.

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Last edited by joed; 06-28-2018 at 05:01 PM.
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Old 06-29-2018, 08:42 AM   #4
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Re: Pergola Sway


Also better fasteners at the joints. I don't see any metal brackets except the footing. Screw or nail, they are probably already loose in the holes.
You can get little creative and where joed drew the red lines, go above the rafter with cross brace and come down on the header across. Or at least use metal brackets to connect the red lines to the headers for reinforced joint.
Some swaying would be ok for your structure as well, but that depends on how good the joints are.
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Old 06-29-2018, 05:55 PM   #5
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Re: Pergola Sway


Not sure there is room on the pier for this but these things come in a Varity of heights and shapes, I would want the tallest one with a flat bottom. The bolt would have to be at least 2" from the edge of the concrete pier.
http://tcsportcharlotte.com/Simpson-...k-Install.aspx
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Old 06-30-2018, 09:50 AM   #6
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Thank you all for the advice.

The post holders were tricky because we are using 4x8 posts which limited us to using 4 inch post holders.
We are using Simpson Strong tie Outdoor Accent brackets and screws which is quite beefy.
I like the idea of adding a new beam and the post brackets.
The whole pergola is 11 ft up so eliminating the sway completely without attaching it to the house will be difficult.
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Old 06-30-2018, 11:58 AM   #7
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Re: Pergola Sway


Referring to top left of pic 2:
-Nice cross brace towards "inside" of pergola
-Another (slightly smaller) brace could be added on the outside/left
-Same goes for upright/brace in background
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