Is This Beam Strong Enough

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  #1  
Old 03-03-07, 08:40 PM
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Is This Beam Strong Enough

Hi,
New to the board but have been reading awhile,you all seem to know
your stuff,I'm having a log home built this june its a single floor home
and its 30by40 feet.

My question is,while looking at the plans i recieved i noticed that the
main beam for the subfloor which runs the 40foot lenght says to use
three 2by12's nailed together to make up the 40feet with each end
sitting on the foundation walls and four post to support the center
section,is three 2by12's enough? I have never seen that its allways
4 or 5 2by10's or something like that.

As you can tell i'm no carpenter but was just wondering what some
of you here think about that setup,the only thing it could be is the
log home vs stick built,thanks.
 
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  #2  
Old 03-04-07, 07:43 AM
Join Date: Mar 2005
Location: USA
Posts: 6,126
Is This Beam Strong Enough

The size of the beam will depend on what distance it spans between supports. This was probably based on the strength of the materials.

Often, strength is not the best criteria. A stronger(wider) beam will give you a btter "feel".

If you are uncomfortable with the design, just widen the beam by adding a 2x12 or two.

You main problem/difference with a log home is the log shrinkage and gaps above or below the dorrs and windows to account for this.

Dick
 
  #3  
Old 03-04-07, 09:04 AM
Join Date: Dec 1999
Location: South Dakota
Posts: 3,140
I may be wrong, but what I think they are trying to tell you is to make a 40' beam, by splicing 2x12's together three thick. In other words you want it 3 2x12's width wise. They are staggered and bolted together to make a forty foot beam. With a support at the center of the beam. For 40 feet I would put my supports about every 12 or 13 feet apart. Good Luck
 
  #4  
Old 03-05-07, 08:37 AM
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Thanks guys

Thanks for the reply,

Jack,yea they want the beam 3 2by12's thick i just
though that was to thin for that lenght but maybe not
with the 4 support post and each side resting on the
foundation.
 
  #5  
Old 03-05-07, 02:13 PM
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Beam

Four support posts would give 5 spans of 8 feet each.
 
  #6  
Old 03-05-07, 04:41 PM
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Originally Posted by Wirepuller38 View Post
Four support posts would give 5 spans of 8 feet each.
Is that a good span for a 40 foot beam,thanks
 
  #7  
Old 03-05-07, 05:00 PM
Join Date: Dec 1999
Location: South Dakota
Posts: 3,140
Yes, that is a good span. You will have very little deflection. Good Luck
 
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