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RE: RE: Oversized holes in sill plates

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One more comment on this subject:
I attended the wood fair about three weeks ago and this subject was
discussed by the panel at the end of the day. The reason that Los Angeles
City code specified the oversized plate washer was to compensate for the
poor workmanship the common occurance of oversized holes. In the discussion,
an 1/8" oversized hole was not considered to bad when compared to what was
discoved in the field. I've seen conditons both locally and in Los Angeles
area where plate are not only sized 1/4" oversized, but are literaly sliced
out from the edge so the wall could be slid into place rather than dropped
over the anchor.
I think what Ralph needs to realize here is that the desired specification
by code is not being adhered to in the field. We don't require Structural
Observation on bolt hole diameters to check that the holes were drilled to
the specification that we included on our design drawings. Therefore, the
use of the oversized plate washer was done to insure that there was
sufficient area over the hole to prevent plate splitting due to both prying
action and lateral movement of the plate parallel and horizontal to the

Dennis Wish PE

-----Original Message-----
From: Rhkratzse(--nospam--at) [mailto:Rhkratzse(--nospam--at)]
Sent: Wednesday, October 28, 1998 5:14 PM
To: wish(--nospam--at); seaint(--nospam--at)
Subject: Re: RE: Oversized holes in sill plates

In a message dated 10/28/98 4:33:08 PM, wish(--nospam--at) writes:

>one work-around that is used on the new Simpson Strong-wall and Hardy
>which provide slotted holes for last minute adjustment: Use a 2" Square
>plate washer like the Simpson BP's. You can drill the corners to allow
>for a
>small #6 or #8 wood screw (4 ea.). Screw the plate washers in place after
>the wall is adjusted or set. This should remedy the movement of the plate
>due to the oversized holes.

Does the capacity of 4 #6 or #8 wood screws equal the capacity of a 5/8"
anchor bolt?  Is it adequate to transfer the horizontal load to the anchor
bolt at the top of the wood foundation plate (1.5" above the top of
instead of transferring the load through the full depth of the fdn. plate?
tend toward "no" on both of these questions.

Ralph Hueston Kratz, S.E.
Richmond CA