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Re: Residential wood stud heights and stresses

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This sounds like a topic for someone who has an opinion on the
"Conventional Framing Provisions" of the UBC.

Dennis?

Regards,
Bill Allen

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> From: HARRISENGR(--nospam--at)aol.com
> To: seaoc(--nospam--at)seaoc.org
> Subject: Residential wood stud heights and stresses
> Date: Saturday, February 14, 1998 10:20 AM
> 
>       I would appreciate hearing what others do on 10' wood studs : 2 x 4
or 2
> x 6 , particularly in tract work.
>      '94 UBC table 23 I R 3 allows 2 x 4 up to 10' for a two story.
>      Section 2304 limits stresses.
>      Sec 2326.11.9 allows 25% notches (  7/8 " in 2x4 )
>      Sec 2326.11.10 allows 40% bores ( 1-3/8 " in 2x4 ) but must be some
> distance from a cut or notch ( 2" ? )
>       I am working on a tract with 10' first floor plates, 20' 2nd floor
joist
> spans ( no light weight concrete ) , and 38' roof truss spans ( heavy
tile ).
> Standard grade studs are overstressed without any holes or notches, No. 2
> grade studs is not common but they are overstressed if any bores or
notches
> are added ( sec 2308 : flex plus axial ). With current electrical,
plumbing,
> telephone, cable, sound, vacuum, etc, requirements i don't see how this
could
> ever be within stress limits. Not to mention a HD8 in a 4 x 4 !
>       I am recommending 2 x 6 studs.
>       The architect and developer are bewildered that i even consider
this
> when virtually all the tract houses in this area use 2 x 4 studs and it
is
> allowed by table 23 I R 3.
>      When i consider this, i have in my mind the 2 story house in
thousand
> oaks i evaluated after the Northridge earthquake ( 20 mi. away) that was
> similar and had almost every 2 x 4 stud on the first floor split and
> shattered.
>      Thanks in advance.
> 
>      Tom Harris, SE
>      Thousand Oaks, CA
> 
>