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Re: 2x2 Plate Washers for WSP Shear Walls (UBC)

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 Allow them to notch the floor p.w. and sole plate at the a.b. heads.

Pat Clark, P.E.

----- Original Message -----
From: "Paul Feather" <pfeather(--nospam--at)SE-Solutions.net>
To: <seaint(--nospam--at)seaint.org>
Sent: Tuesday, August 26, 2003 9:23 AM
Subject: Re: 2x2 Plate Washers for WSP Shear Walls (UBC)


> Bill,
>
> Under chapter 18, the plate washers are required at all bolts.  (1806.6.1)
>
> I do not know of any approved alternate round washer.  Since you are
nailing
> directly to the plate, I have seen 4x plates with the entire top cross
> section dapped out for the bolts and washers.  A 3" gap in the plate
surface
> isn't such a big deal.  Alternatively I have seen the 3x plate with bolts
> and then an additional level of flat 2x blocking between the bolts prior
to
> setting the joist hangers.  Seems to be easier than dapping the plate with
> less room for defect.
>
> HTH
>
> Paul Feather PE, SE
> pfeather(--nospam--at)SE-Solutions.net
> www.SE-Solutions.net
> ----- Original Message -----
> From: "Bill Allen" <T.W.Allen(--nospam--at)cox.net>
> To: <seaint(--nospam--at)seaint.org>
> Sent: Tuesday, August 26, 2003 8:57 AM
> Subject: 2x2 Plate Washers for WSP Shear Walls (UBC)
>
>
> > Ref: UBC Table 23-II-I-1 (p. 2-288), footnote 3
> >
> > My situation:
> > Visualize a concrete stem wall, 3x sill plate and raised floor framing.
> > The floor joists are framed flush, hung off the 3x sill plate with
> > hangers. Sheathing over sill plate. Stud wall framed above. Based on
> > this condition, the anchor bolts have to be dapped into the 3x (or 4x)
> > sill plate.
> >
> > Using a 4x sill plate, if the dap is such that I still have 2-1/2" of
> > "meat" left (I know this is difficult for the nut on a 5/8" anchor bolt
> > plus a few threads, but bear with me), then I (believe I) still have a
> > "qualified" 3x sill plate.
> >
> > The problem comes in getting in those *damn* square washers. The
> > diagonal on a 2x2 washer is almost 3", not leaving much edge or
> > tolerance in a 4" (nom.) stud wall.
> >
> > Question 1: Is there a code provision for an alternate, equivalent round
> > washer? If a 2-3/8" diameter washer is equivalent, then a 2-1/2"
> > diameter hole saw would work.
> >
> > Since the Beginning of Time (i.e., publication of the 1997 UBC), I have
> > been under the impression that these washers are required for all
> > anchorbolts in shear walls (in Seismic Zones 3 and 4 which are the only
> > ones I care about). In reading Footnote 3, it almost appears that the
> > washers are only required if one is trying to use a 2x sill plate for
> > shear walls with less than 600 PLF.
> >
> > Question 2: Is this just (more) cumbersome code wording or is it true
> > that these plate washers are _only_ required when one is trying to use a
> > 2x sill plate on shear walls designed for less than 600 PLF in Seismic
> > Zones 3 and 4?
> >
> > That's all for now. I have to go back and continue reading the Statement
> > of Qualifications for the gubernatorial candidates. Sheesh!
> >
> > Regards,
> >
> > T. William (Bill) Allen, S.E. (CA #2607)
> > V/F (949) 248-8588
> > San Juan Capistrano, CA
> >
> > "Lord, I can't go yet. I've still got one more detail to do!"
> >
> >
> >
> >
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