Question about roof ridge beam

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  #1  
Old 08-09-11, 11:01 AM
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Question about roof ridge beam

I am reconstructing a 12x16 shed. The previous owner had used a ridge beam that was 2x6x16 feet long and the roof was sagging a bit. I was planning on replacing it with a 2x8 or a 2x10, but then I got to thinking...replacing the beam with something taller would require me to do a lot of cutting to "pre-fabbed" roof sections to make sure they fit correctly.

I now have the bright idea (or so I think) of sistering (2) 2x6x16's together. I am think this will give me the added strength I need to keep the roof from sagging. My internet research is telling me otherwise, as a couple of people claim that sistering does not add strength, just weight.

Any thoughts? Should I sister a couple of 2x6's together, or go the 2x8 or 2x10 approach?

Thanks in advance,
Bryan
 
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Old 08-09-11, 03:07 PM
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A 2x6 won't span 16' no matter what, so I would go with a minimum of 2x8 doubled. Depending on how long your rafters are, you may be upgrading them, too.
 
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Old 08-09-11, 03:09 PM
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Larry, what about collar ties? would that allow him to get by with smaller lumber?
 
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Old 08-14-11, 03:27 PM
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Roof

Yeah, what about collar ties? The ridge beam should not have to support any weight.
 
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Old 08-14-11, 06:25 PM
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You're both right, but if he is using 2x6 for rafters, it won't all bear on a lateral 2x6 fully. It will stick down below it. I should think he would want full bearing of the rafter, and thereby use 2x8 lumber to have the full surface bearing. I just lost my cursor . Collar ties would be a given.
 
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Old 08-15-11, 07:28 AM
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Ridge Beam

I agree with Larry. The rafter ends would be cut at an angle. 2x8's would be a better choice for the ridge beam.
 
 

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