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Old 04-07-2008, 08:30 PM   #1
Join Date: Jan 2008
Location: Michigan
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Pergola Unsupported Length

Hi All,

I am in the design phase for a Pergola I am going to construct and want to know if my unsupported length is too long. I am currently planning on a freestanding structure 14'4" x 5'10" with 6"X6" posts at the corners. The girders and rafters will be 2"X6" layed in a grid pattern, evenly spaced. All construction is with Cedar. Is the 14'4" too long of an unsupported length for the dead weight of the pergola? Should I plan on putting another 6"X6" post in the middle. I am not planning on this bearing any load besides the weight of the structure itself.

Thanks in advance.

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Old 04-08-2008, 04:58 PM   #2
Join Date: Jan 2008
Location: Michigan
Posts: 26

Pergola Unsupported Length


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Old 04-08-2008, 10:56 PM   #3
Join Date: Mar 2007
Location: Long Island, NY
Posts: 9,519

Pergola Unsupported Length

For 14+ feet a 2x8 would be too small. Double 2x10's, one on either side of the 6x6 along the 14 feet. I would also put spacers every 3 feet or so to unitize the 2x10's. The 2x6's on top spanning the 5'10".
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