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How far can 2x12 span before bracing?
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Re: How far can 2x12 span before bracing? By  TomW702

Posts: 0

10/19/2005 3:40:00 AM

Are the 2 2X12s being used as a ridge beam and if so what is the span of the roof?

Another factor that will come into play is the area you are located in and what the snow loads are for your area.


   

Re: How far can 2x12 span before bracing? By  new guy

Posts: 0

10/19/2005 4:07:00 AM

Spec. and grade of lumber, in addition to the beam''s function and imparted loads will factor into what''s required.

Have an Engineer evaluate the pertinent parameters and prescribe a design.


   

Re: How far can 2x12 span before bracing? By  Loui1

Posts: 0

10/19/2005 4:25:00 AM

roof height is needed to figure out the wind pressure uplift on there.


   

Re: How far can 2x12 span before bracing? By  jbeaudry

Posts: 0

10/19/2005 8:37:00 PM

TomW702 >> Yes, the 2x12s are being used as a ridge beam. The span of the ridge is 23 feet. I live in the pacific northwest, and we see snow yearly, but generally not a lot and not for very long. At most the roof would probably see 2 or 3 feet of snow, and that is a *very* rare occasion.

New Guy >> I don''t know the grade of the lumber, but my guess would be that it is the best fir 2x12s you could get (the grain looks perfect and there isn''t the slightest bend or anything in the wood). My dad is the one who originally built the structure about 10 years ago, and he always over does it to make sure things are safe since he isn''t an engineer; so I am sure he spared no expense when it came to those 2x12s.

Loui1 >> from the floor of the building to the ceiling ridge is 12 feet. I am not worried so much about the upward lift from wind... the roof is pretty well secured to the walls and the rest of the structure is built like a tank. The only questionable part I can see if whether or not a support post is needed mid span of the ridge line.

My thinking is that there is no DOWN force on the ridgeline... just eaqual force from the side (coming from each side of the room). I am thinking a support beam wouldn''t really provide a benefit because the outside walls would have to give in before the roof could colapse in. But I am not experienced with this stuff, hence my showing up at this site. :)

Thanks for all the replies... I appreciate you taking your time to try and help!


   

Re: How far can 2x12 span before bracing? By  Bartonbuilt

Posts: 0

10/19/2005 10:30:00 PM

What type of roof is this? ie. hip,gable or mansard? What is the dimension, span and on center spacing of your rafters and what is their secies and grade? What is the roofs pitch?


   

Re: How far can 2x12 span before bracing? By  pwood

Posts: 0

10/20/2005 9:52:00 AM

jbeaudry,
i would recommend that you consult a design professional.did this project go thru a plan check and a permit issued with approved plans and specifications?curious!


   

Re: How far can 2x12 span before bracing? By  George Roberts

Posts: 0

10/20/2005 12:39:00 PM

The structure is 10 years old.

I expect that a few measurements, deflection of the ridge and spread of the walls, would be enough to answer the question.


   

Re: How far can 2x12 span before bracing? By  jbeaudry

Posts: 0

10/20/2005 8:16:00 PM

The structure is at LEAST 10 years old, maybe closer to 12, I can''t recall exactly. I''ll work on getting answers to these questions tomorrow and report back as soon as I get them. Thanks again!


   

Re: How far can 2x12 span before bracing? By  jbeaudry

Posts: 0

10/21/2005 8:02:00 PM

I beleive the roof is called gable. It is a 4.75 pitch. The dimensions of the building are 17''x23'' (the span is 23''), its 24" on center, the rafters look like wood I-Beams (roughly 13" tall)... not sure about series and grade (not sure what that is).

Thanks.


   

Re: How far can 2x12 span before bracing? By  jbeaudry

Posts: 0

10/26/2005 7:38:00 PM

Anybody know?

Thanks.


   

Re: How far can 2x12 span before bracing? By  TomW702

Posts: 0

10/27/2005 3:50:00 AM

Are there rafter/collar ties attached to the rafters?

If there are not, then looking at the the header & beam chart from the southern pine council, it appears that the max. clear opening you could have on a 2 ply 2X12 is 10''. The chart I''m looking at is using a ground snow load value of 50 psf. Not sure of what the exact snow load value is for your area.

Hopes this helps some.


   

Re: How far can 2x12 span before bracing? By  jbeaudry

Posts: 0

11/9/2005 2:40:00 PM

Yes, there are collar ties. I ended up throwing a support beam up in the middle of the floor, so I guess this question can be closed at this point. Better to be safe than sorry. :) Thanks to everyone who responded.


   

Re: How far can 2x12 span before bracing? By  peach!!

Posts: 0

11/9/2005 3:59:00 PM

4x12 is outside the scope of the Code.. but I will offer this.. my old house has 2x4 rafters in a 50 pound gsl (ungraded red oak).. that until recently held 4 layers of shingles (bet they breathed a sigh of relief when we ripped them all off and replaced with one layer).. wood is a remarkable product (I feel oddly like Horshack from welcome back kotter.. oooo Mr. Kotter, Mr. Kotter.. ).. I didn''t bother reading your last post, jbeaudry


   

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2015 I-Codes