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Author Topic: I Needed A Big Beam 30 Feet Long  (Read 1643 times)

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Offline Drilling Man

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I Needed A Big Beam 30 Feet Long
« on: October 19, 2012, 05:44:03 AM »
  See the bigger log, on the right, in this pict.?
 

 
  It was left over from a materials list that i was milling out, for a customer/friend of mine. Anyway, i needed to build a strong "beam", so i milled that big log "mostly" into 2x14/16's - 16 feet long, and then put them on stickers. Later when i had the time, i loaded them back on the BSM and resawed them all at the same time, to get some really NICE 2x12's...
 

 

  Then i put ratchet straps around them and moved them to a long trailor that i have,


 
  I bought several sheets of 3/4" CDX plywood on sale some time ago, and brought them out of the shop two at a time, to resaw them into 12" widths,


 
  Now it's time to get started building the 30 foot beam that i need! So i put down two 2x12's, adding plenty of "liquid nails", and put a layer of CDX on top, useing LOT'S of nails to nail them together!


 
  and kept adding layers, making sure to alternate the joints,


 
  With the beam getting pretty thick, i changed to longer and longer nails, so this "palm nailer" really saved my old wore out joints!!


 
  Until i FINALLY had my 9"x12" - 30 foot beam!


 
  Glueing and nailing layers of ply between the layers of solid wood, GREATLY increases the strength of a beam, it makes it MUCH stronger, ableing it to carry much greater loads!

  So, there's how i used the the lumber from that big log in the pict., to build a big beam that i needed.

  DM
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Offline FPH

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Re: I Needed A Big Beam 30 Feet Long
« Reply #1 on: October 19, 2012, 10:57:02 AM »
A beam that long I always make a Flitch beam of by using 1/4" or 3/8" plate sandwiched between the 2x12........make note of the crown.
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Offline PowPow

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Re: I Needed A Big Beam 30 Feet Long
« Reply #2 on: October 19, 2012, 06:12:44 PM »
How much deflection would you expect to get when you load up a beam like that?
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Offline FPH

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Re: I Needed A Big Beam 30 Feet Long
« Reply #3 on: October 19, 2012, 06:47:16 PM »
With the steel plate, only about 1/8 ".  Without the steel .........as much as an 1 1/4".
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Offline blind ear

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Re: I Needed A Big Beam 30 Feet Long
« Reply #4 on: October 20, 2012, 03:09:03 AM »
FPH, Do you use a stress and loads book to figure your compound beams or just know from experience? Thanks: ear
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Offline FPH

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Re: I Needed A Big Beam 30 Feet Long
« Reply #5 on: October 20, 2012, 04:58:48 AM »
Quote from: blind ear on October 20, 2012, 03:09:03 AM
FPH, Do you use a stress and loads book to figure your compound beams or just know from experience? Thanks: ear

Any home made beam will differ depending on the material used to construct the beam.  I am just using my experiences from 40 + years of framing ad construction.  Heck I once had a 80 ' glue lam beam that was ordered with 1/4 crown, and after all the load it still had 1/4 crown.
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Offline blind ear

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Re: I Needed A Big Beam 30 Feet Long
« Reply #6 on: October 20, 2012, 06:22:34 AM »
Experience, the very best teacher. None available for that type local that I have found, yet. ear
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Offline Drilling Man

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Re: I Needed A Big Beam 30 Feet Long
« Reply #7 on: October 20, 2012, 10:15:06 AM »
  I already loaded it, it has 1/2" deflection right now.  It probably will have a bit more with a snow load, but i don't expect much snow to stay on that roof.
 
  DM
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Offline FPH

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Re: I Needed A Big Beam 30 Feet Long
« Reply #8 on: October 20, 2012, 11:37:44 AM »
Quote from: Drilling Man on October 20, 2012, 10:15:06 AM
  I already loaded it, it has 1/2" deflection right now.  It probably will have a bit more with a snow load, but i don't expect much snow to stay on that roof.
 
  DM

How much deflection did you allow for?  How much was the crown?
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