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Old 05-01-2010, 11:30 AM   #1
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Garage build


Garage build-framework.jpg

What would yall recommend for the supporting beams marked in red? The beams span 20'. I was thinking double 2x12 with plywood. Any other ideas? Posts are on 6' centers.

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Old 05-01-2010, 12:21 PM   #2
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The beams in question need to support half the garage roof live load, plus dead load of framing, plus wind load and seismic load if applicable. Your local code should tell you the required loading. You can also get the required information from your local code enforcement official (you are pulling a permit, right?).

You should also look at the requirements for attachment of the beam to the support posts. And while you are at it, you should review the requirements for embedment of the support posts, and minimum sizing of the support posts. Assuming you have not done so already.

By the way, nice drawing.

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Old 05-01-2010, 12:25 PM   #3
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If that's all the structure a good wind will topple that garage right over. Your going to need lateral bracing. Is the full 20' end goiing to be open?

Why beams every 6'? Good trusses will span the 24' without intermediate beams. If you'll stick frame and/or put load in the attic or occupy it then you might need 1 or 2 intermediate beams depending on the ceiling joist size.

Beam size really needs to be calculated by an engineer or use of prescriptive tables depending on location and construction details.
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Old 05-01-2010, 12:34 PM   #4
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The structure is attached on 1 side. I want the beams so i can better utilize the space above. I created the "trusses" as a component in the rendering. They are for reference purposes only.Traditional plywood decking and composition roofing on top. Plywood sheathing on the sides may increase lateral stability. Thanks for the help guys.
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