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RE: Shearwall Blocking Requirements for

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A number of years ago at an APA seminar, they proposed a metal plate on top 
of plywood in lieu blocking below the plywood.  Its use included where an 
exposed ceiling made it undesirable to have blocking below the ceiling.  
When they were asked about point penetration being the controlling criteria 
in nail capacity, they looked at each other as if to say "why didn't someone 
think of that?"

I believe that APA published a Technical Note or Technical Report that was 
included in the nice 3-ring binder that was included with the seminar.

A. Roger Turk, P.E.(Structural)
Tucson, Arizona

Keith De Lapp wrote:

. > The blocking in and of itself is only backing for the fastener to obtain 
. > the required penetration.  If you could fasten the strap to the sheathing
. > without the requirement of fastener penetration, such as glue or welding a
. > metal strap on metal sheathing, the blocking would not be required.

. > Keith De Lapp, P.E.

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