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    jdvaughn's Avatar
    jdvaughn Posts: 1, Reputation: 1
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    #1

    Nov 15, 2011, 10:59 AM
    Beam sizing and spans
    I would like to open up the dining/living room area in my 1 story ranch. I would like to install a 3.5" x 12" laminated beam spanning 20'(BEAM #1). BEAM #1 supports the roof trusses at 24" on center. This beam will be supported at one end by the wall and at the other end will tie perpendicularly into BEAM #2. BEAM #2 is 3.5" on center. This beam will be supported at one end by the wall and at the other end will tie perpendicularly into BEAM #2. BEAM #2 is 3.5" spanning 20.5 '. Beam #2 will be supported at both ends by the walls and is not load bearing and it's only purpose it to support BEAM #1. BEAM #1 ties into BEAM #2, 8' from one end of BEAM # 2. See attached diagram. The beams will be constructed out of 8 layers 2x4's glued and screwed together. My question is: Is BEAM #2 sized adequately to support BEAM #1?
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  1. File Type: pdf Beam span.pdf (121.2 KB, 211 views)
    2. creahands's Avatar
    creahands Posts: 2,854, Reputation: 195
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    #2

    Nov 16, 2011, 11:00 AM
    Hi jd

    Get in touch with a certified architect or structural engineer to evaluate your situation. There are load factors that can answered by them. We don't know if you are in a snow zone or what would be required by your local building dept.

    To do what you want would probably need blue prints with architect stamp.

    Chuck
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #3

    Nov 17, 2011, 03:28 PM
    If they are indeed roof trusses, and 24" centers would indicate that, you don't need any beam. The trusses bear back to the wall. We build Habitat houses with a 24" span, 5/12 trusses and have no intermediate support. I have a 28X40' log home 7/12 trusses and the only reason for walls is for the BR and Bath. Based on what you tell us, Beam 2 will only be holding up 50% of the weight of beam 1. If you want to make some support, consider a strongback in the attic, 2X4 plate and a 2X6 side. That way, you have a nice open free span.
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