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From: Crosier, Jeffrey
To: terry2(--nospam--at) (Terry Weath
Subject: RE: [SEAOC] Re: [SEAOC] Re: [SEAOC] Re: [SEA
Date: Wednesday, May 29, 1996 10:39AM

>From what I know, the L.A. City reduction is now 25% based on their memo of 
May 20, 1994 and subsequently appended.  Prior to that, they required a 20% 
reduction which was effective Nov. 7, 1992 unless you called for special 
inspection, then and only then could you use the common nail values.  The 
20% reduction is based on the allowable values in UBC table 23-I-G (formerly 
25-G) for box nails compared with common nails.  You could work your own 
values which should coincide with the UBC values by following the procedures 
in APA research report 105.  I don't know where the 15% Dennis mentions 
comes from, that figure could possibly be a mistake.  If anyone knows for 
sure, it would be good to know.  My feeling is that the 20% reduction was 
not based on testing, only on calculations but I don't know for sure.

Jeff Crosier, S.E.
From: terry2(--nospam--at) (Terry Weath
To:  seaoc(--nospam--at); Chung-Yuan Wen; Jeffrey Crosier
Subject: [SEAOC] Re: [SEAOC] Re: [SEAOC] Re: [SEA
Date: Thursday, May 30, 1996 7:19AM

>Dennis Wish wrote:
>As far as I know, SEAOSC has done studies for the difference in shear
>walls nailed with sinkers verses common nails. L.A. City has called for
>a degradation of 15% off the rated shear where sinkers are used in lieu
>of common nails.
>I know that there is still some controversy over this issue.
>I also agree with Ray that the major problem with power driven nails is
>the damage to the ply layers. The advantages that I read about power
>driven nails is the advantage of the hot glue that creates a better bond
>with the wood for resistance to nail withdrawl.

        I have heard the same thing: that the covering (green vinyl?)
creates a "glue" which bonds to the sheathing creating shear values
comperable to normal. What did LA City base their 15% reduction on? Testing?
                - Terry

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