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RE: Valley Rafters

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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)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