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Old 10-28-2007, 10:34 AM   #16
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A Beam for a Pergola


IMHO 3 because of the "clear span" you have, 16' at least, unsupported is one heck of a span for 2 x 10.
I would also take 2 pcs of pt 2x6 maybe 3' or so long attach them to the 6 x 6 to form a pocket on top of the post, height of 2 x 10 ( 9 1/2" approx )
above and the rest down and bolted to post. Fancify the ends for pretty sake :}:}:} to help prevent roll which will happen over time. You will have to shim the approx 1/2" on each side and there I am still thunkin bout maybe cedar shakes cut to width so ya dont see em. And I know rest of the folks are gonna think I am crazy, are you familiar with ice and water shield?
self adhering heavy duty rubber membrane, I would put a strip on top of the girder to seal the seams, that would keep the beam much more stable from a moisture standpoint, real ez to do.
Jack

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Old 10-30-2007, 07:31 AM   #17
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A Beam for a Pergola


Jack, I like your ideas. My thoughts are to add one of the 2x8s from the old beam. The crown on it when cut down to 15'5"" to fit inside the posts is right at 1". If I attach it to the beam in the middle and then work my way outboard towards each end trying to take out some of the bow physically, would that be sufficient for adding strength to the beam? An inch crown is alot I know but if I can manage to muscle it up there on the ends, seems to me that would help immensly with support across the span. Do you agree? If I add it right at the bottom of the beam, it would nest perfectly up against the rafters.

I also like the idea of that seal on top you mentioned, and also plan to add some 2x6 pieces to the posts to fortify the support for holding up the beam.

Jeff
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Old 10-30-2007, 11:28 AM   #18
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A Beam for a Pergola


Use a steel beam......it will never sag.......should end the debate.....
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Old 10-30-2007, 12:01 PM   #19
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A Beam for a Pergola


....bingo!...

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