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Old 10-11-2009, 02:58 PM   #1
rac
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Default Free online calculator

Does anyone know the best online calculator for ridge beam sizes and rafter lengths?Trying to see if 2 2x12 will span 32ft with no center post. And what pitch a 16 ft rafter will go 14 ft. and leave about 1ft. overhang.Thanks.
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Old 10-11-2009, 04:25 PM   #2
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Default Re: Free online calculator

good luck finding a 32' 2x12.
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Old 10-11-2009, 04:33 PM   #3
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Default Re: Free online calculator

Why don't you just call your local truss company and ask them?
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Old 10-11-2009, 04:34 PM   #4
DCLXVI
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Default Re: Free online calculator

Try http://www.southernpine.com/
Didn't see anything 32 feet long though.
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Old 10-11-2009, 04:41 PM   #5
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Default Re: Free online calculator

A 24' is going to be the largest 2x12 w/ grade stamp on it. You can get larger one's milled if you are lucky. Then you have get them dry and inspected. Your best bet is going to be to get an engineered beam.

Last edited by Jaxrunner; 10-11-2009 at 04:48 PM.
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Old 10-11-2009, 04:45 PM   #6
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Default Re: Free online calculator

32' is a long way for a free span.
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Old 10-11-2009, 06:02 PM   #7
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Default Re: Free online calculator

32 foot unsupported span, in structural wood, no way, no building department would allow it.
According to the link, seems possible but impractical/expensive in engineered wood...
Guessing you would need roughly 36-40" beam height, and your retirement savings to pay for them.

http://www.datummarketing.com/articles/lumber.pdf
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Old 10-11-2009, 06:15 PM   #8
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Default Re: Free online calculator

There are several variables to sizing your ridge beam. You really need to give us a better idea of your garage design. If you give me more information I do not mind doing a quick calculation to give you an idea on the size beam you will need. I have never in 9 years sized an engineered beam larger than a 24" depth. You might want to also think about using ceiling joists. That will reduce the size of the beam.
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Old 10-11-2009, 07:50 PM   #9
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Default Re: Free online calculator

The garage I had was 20x28 and used 2 2x12x14 for ridge beam bolted together end to end and 2x8 for rafters with a cable across half way to hold sides for support.Was wondering if I double 2x12 would it span 32ft.without center post.
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Old 10-11-2009, 07:53 PM   #10
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Default Re: Free online calculator

Forgot to put garage I'm building is 28x32
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Old 10-11-2009, 08:51 PM   #11
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Default Re: Free online calculator

I would say no. In general, when ever you have a splice in the beam you need a support directly under it. The other option in to make a connection strong enough for the loads in every direction. The cable seems like it is just holding the walls from falling out.
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Old 10-11-2009, 09:42 PM   #12
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Default Re: Free online calculator

Could the garage be made with joists and a ridge board? Then the rafters hold the ridge board and the joist holds the walls together. You will have a ceiling then.

I am no carpenter but that is how my 24X50 garage was made. I wanted stem walls upstairs but it got too complicated getting a ridge beam so I went with conventional construction and a ridge board. Again I am no carpenter but that was how it was explained to me.
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Old 10-11-2009, 11:07 PM   #13
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Default Re: Free online calculator

Go with a flitch beam (steel plate sandwiched between 2 2x12's) or a steel beam with nailers added to the top flange.
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Old 10-11-2009, 11:58 PM   #14
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Default Re: Free online calculator

My ridge beam spans 27'. It's 2 6"x12 tied together with a Simpson connector and center support beam. The support sits on top of a PSL beam, 7"x16"x20'.

From what you are asking....it looks like you need to get an engineer to works things up....
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Old 10-12-2009, 04:57 AM   #15
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Default Re: Free online calculator

According to the Pocket Reference Guide, the maximum joist recommended is a 24' 2x12 ans max span for it is 18' give or take a couple of inches. As far as pitch you are going to roughly get 3:12 or 3.5:12 out of a 16' long board
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Old 10-12-2009, 05:51 AM   #16
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Default Re: Free online calculator

This one won't help you with beam sizing, but it will give you rafter lengths for various pitches and overhangs. I like it a lot and best of all its free.

http://www.northbridgesoftware.com/calc.html
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Old 10-12-2009, 09:04 AM   #17
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Default Re: Free online calculator

Look at Lite Steel Beam.com

They have a new product for this purpose and does not need crane to place it.
Two people can install.
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