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RE: Valley Rafters

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This is getting better.


Continuing on with similar language in the 2003 IRC (Section 802.3) it says”


“Where roof pitch is less than 3:12, structural members that support rafters and ceiling joists, such as ridge beams, hips, and valleys, shall be designed as beams”. Otherwise, this section claims they only need be supported at the ridge with a brace to a bearing partition.


This is refreshing…discussing codes and engineering…


Barry H. Welliver



From: Gustavo Franco [mailto:gfranco(--nospam--at)]
Sent: Friday, September 09, 2005 5:06 PM
To: seaint(--nospam--at)
Subject: RE: Valley Rafters



I dont know  of  any other way to get the smallest member possible than to design the member, also I believe this kind of framing IS called stick framing. 


 Did somebody maybe mean to ask  for you to use prescriptive design (conventional light frame construction) ?


The calif building code conventional construction section 2320.12.3 states "... at all valleys and hips there shall be a single valley or hip rafter not less than 2-inch nominal thickness and not less in depth than the cut end of the rafter". There are limitations for allowing this.



From: Avicpeng
Sent: Friday, September 09, 2005 3:21 PM
To: seaint(--nospam--at)
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

----- 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)

-----Original Message-----
From: Avicpeng [mailto:vicpeng(--nospam--at)]
Sent: Friday, September 09, 2005 15:04
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