Support beam under center of trusses

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  #1  
Old 08-25-17, 11:37 AM
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Support beam under center of trusses

I recently bought a house with a detached garage. The garage is 20' wide by 25' deep. The roof is a 2x4 truss 24" OC. I know that you are not supposed to store anything on top of the trusses. However, there is a 6x12 beam that is running down the center of the garage about 2" below the bottom chords of the trusses. I'm wondering what purpose this beam has? I would like to put some vertical 2x6 boards parallel to the trusses on top of this beam and put 1/2" OSB on top of the 2x6s to create an 8' wide storage area for lightweight items. Thoughts/advice?[img]https://*******/mFyeBk[/img] Should I nail/screw the 2x6s to the 2x4 trusses or keep them separate?

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Old 08-25-17, 02:55 PM
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Keep it separate. The bottom chord of the truss has to be able to expand and contract, rise and fall as needed. There would be nothing wrong with filling the 2" space with something, but they should not be fastened together.
 
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Old 08-25-17, 02:58 PM
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If the trusses are not attached to the beam then the beam is not doing much to support of the roof.

Possible that the beam was used as some type of structure to pull an engine or some other type of lifting?

How is the beam supported in the walls?

Seems like you could fill in the gap and then add flooring to the top of the trusses!
 
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Old 08-25-17, 03:13 PM
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It looks like the beam is supported by the exterior studs. I can't see exactly but it buries itself into the exterior wall. It's probably supported by three sandwiched 2x4s.
 
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Old 08-25-17, 03:49 PM
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My guess is that the previous owner used it as a support for a diy engine hoist.

Or maybe he laid the trusses on them during construction before standing them up.
 
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Old 08-26-17, 08:01 PM
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got my storage shelving built

Thanks for all the advice. I sandwiched a 2x12 on top of the 6x12 beam to take up the space under the bottom chords. It was an exact fit. Then I ran a 6ft long 2x4 along each side of the chords to sandwich each one, and screwed the 2x4s to the 2x12. I put 6ft wide 1/2" plywood on top and only screwed the plywood to the new 2x4s. I did not alter or screw into any of the truss components. I'm only going to store lightweight items up there, clothing, Xmas stuff, etc. I'll post up some pictures tomorrow, but I feel pretty good about the end result as it shouldn't have any structural impact on the garage roof and I added about 100sq ft of storage space!
 
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Old 08-27-17, 05:23 AM
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With that beam supporting the trusses now and a platform built off the beam using the trusses for alignment I doubt you will have any weight issues up there!
 
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