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RE: Valley Rafters

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In my mind, Valley Beams and Hip Beams are one and the same when it comes to supporting Rafters.  The only time the Rafters hold up the Hip beam is if the rafters have a collar tie (or similar) at the bottom support.
 
My response earlier about being "iffy" should have read that they are always designed.  It's just a question of whether it needs to be documented.  If I see a hip or valley beam that is fairly typical, it becomes more of a question of should it be the same size as the rafters or doubled.  If I feel like it might need more then that, I will run a calc based on the load distribution, checking both strength and deflection.
 
I have had Valley beams that were 20 ft long and I could just tell that it was going to take more then (2) 2x10. 
 
HTH,
 
Seth W. Cutler, P.E. 
Silverdale, WA
e-mail:  seth.cutler(--nospam--at)navy.mil
 
-----Original Message-----
From: Barry H. Welliver [mailto:barrywelliver2(--nospam--at)earthlink.net]
Sent: Friday, September 09, 2005 15:38
To: seaint(--nospam--at)seaint.org
Subject: RE: Valley Rafters

Valley beams are definitely design-worthy. Hip beams….maybe not so much.

 

Rationale is the deflection (gravity) for valley rafters is detrimental to what’s below. Hip beams have all those nice rafters helping it along.

 

I would not, however, refer to either as a “rafter”.

 

Barry H. Welliver

barrywelliver2(--nospam--at)earthlink.net

 


From: Avicpeng [mailto:vicpeng(--nospam--at)telus.net]
Sent: Friday, September 09, 2005 4:21 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: Valley Rafters

 

What would you consider "iffy"?  BTW I'm not just asking dumb questions here.  I'm putting together an engineer's retort to, "... Do we need such a large valley beam?  Can't we just stick frame it? ..."


Thor Tandy P.Eng MIStructE
Victoria, BC
Canada
vicpeng(--nospam--at)telus.net

----- Original Message -----

Sent: Friday, September 09, 2005 3:13 PM

Subject: RE: Valley Rafters

 

Yes, since the member size/type will depend on the geometry and span of the valley rafter/beam.  Based on experience, I would determine if the span/load required a detailed calculation.  For standard stuff, I won't do a calculation but anything that is iffy I check it out. 

Seth W. Cutler, P.E. 
Silverdale, WA
e-mail:  seth.cutler(--nospam--at)navy.mil

-----Original Message-----
From: Avicpeng [mailto:vicpeng(--nospam--at)telus.net]
Sent: Friday, September 09, 2005 15:04
To: SEAINT
Subject: Valley Rafters

And just to start ... does anyone design the valley rafter of a roof, or do you write it off as "standard framing"?  If not, why not?  If so, why?


Thor Tandy P.Eng MIStructE
Victoria, BC
Canada
vicpeng(--nospam--at)telus.net