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Pergola question

Posted by mconn77 (My Page) on
Tue, Aug 19, 14 at 15:18

Our pergola span is 18' OC x 14' OC using 6x6 posts, two 4x12x20 support beams, and 4x6x18 rafters. We also added a knee joint using a 4x4 (2' down and across). The wood is cedar. My question is - should the knee braces go out further than 2' and/or should we have used a 4x6? We just finished it this weekend but it would be easy to replace. We're also considering adding 2x4x10 (or 12) boards to the top (effectively spanning 20-24' parallel to the support beams). Just want to make sure we have enough support. Thanks!


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RE: Pergola question

There isn't a bunch of load on the beams, though, weather could sag them eventually. If you are concerned, 6x6 posts mid-span on the beam would make it bullet-proof. I would also highly recommend adding metal flashing to the top of the beam, that way water won't sit and rot (eventually, many years) the beam.


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