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Old 11-05-2011, 01:01 PM   #1
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beam size for spanning 12' 6"


I'm planning on taking out a load bearing wall that supports the rafters from the attic. total width of area is 22' so 2x8x12 come in from each outside wall and rests on the bearing wall. I'm thinking there may be two 2x10's there now but i have to check. there is a 2x10 header for a 5' door opening that is part of the 12'6" span I will be opening up.

Thanks

Kevin


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Old 11-05-2011, 01:07 PM   #2
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beam size for spanning 12' 6"


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Old 11-05-2011, 01:28 PM   #3
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beam size for spanning 12' 6"


consult a engineer first, dont remove anything other than drywall before you have the engineer give you a spec of what size beam to use
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Old 11-05-2011, 02:28 PM   #4
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beam size for spanning 12' 6"


I would doubt it is a 2x10 header for a 5' opening to start with. Sounds like you need to get some help from an engineer or a contractor on site. Give a couple contractors a call to have them look at it and give you a bid on what needs to be done.
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Old 11-05-2011, 06:27 PM   #5
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beam size for spanning 12' 6"


Please post a sketch of what you have in mind. My brain is about to explode from trying to figure out that description.

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Old 11-05-2011, 06:58 PM   #6
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beam size for spanning 12' 6"


If I recall a quick calculation is 2" per 1' of span but i do not recall the max length for that but that might explain the 2" X 10" for a 5' span.

This might help if you want to concider Engineered beams.

http://www.ilevel.com/literature/TJ-9000.pdf
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Old 11-05-2011, 07:48 PM   #7
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beam size for spanning 12' 6"


what its supporting, wind load, snow load all factor into the size of the beam..


most homes ive framed or renovated.. ive installed 3ply 2x10 headers for openings between 5'- 8'. provided no bearing points were above... if any pointloads were on top we'd use 2ply lvl, or a microlam
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Old 11-05-2011, 11:26 PM   #8
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beam size for spanning 12' 6"


Of course there are many different options available to the OP, LVL, microlam, laminated 2xs. His description is just too vague. We don't even know what code if any he would be working with.
Kevin, for god's sake man, give us info.

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Old 11-06-2011, 08:50 AM   #9
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beam size for spanning 12' 6"


yah.... thats why i said to consult an engineer.. and not the type that gets to wear the cool hat and drive the train
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Old 11-07-2011, 11:47 PM   #10
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beam size for spanning 12' 6"


22' wide building with "2x8x12 come in from each outside wall and rests on the bearing wall." 2x8 for ceiling joists from each side to center?

IRC for the 12.5' span may be too wide for his (probably 4") interior center wall—more than 4-2x12’s, last chart: http://publicecodes.citation.com/ico...002_par021.htm

Looks like an engineered beam, OP……. check for rafter purlins and struts in the attic. Remember solid blocking in the floor cavity to the earth on a new footing the S.E. will call-out for you.

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Old 11-08-2011, 12:59 AM   #11
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beam size for spanning 12' 6"


Quote:
Originally Posted by GBR in WA View Post
22' wide building with "2x8x12 come in from each outside wall and rests on the bearing wall." 2x8 for ceiling joists from each side to center?

IRC for the 12.5' span may be too wide for his (probably 4") interior center wall—more than 4-2x12’s, last chart: http://publicecodes.citation.com/ico...002_par021.htm

Looks like an engineered beam, OP……. check for rafter purlins and struts in the attic. Remember solid blocking in the floor cavity to the earth on a new footing the S.E. will call-out for you.

Welcome to the forum!

Gary
Oh. look at that, Gary wants you to deal with an S.E. no PEs for him.


Just messing with ya Gary.

Andy.

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