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RE: screwed wood diaphragms

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My understanding is that screwed diaphragms are quite rigid with the end
result that you get blow-outs in the plywood when the laminate glue or
the wood fibers fail.  Nails allow for a certain amount of flex in the
system as a whole.  You should verify that using a screwed diaphragm
doesn't require a rigid diaphragm analysis (ugly).

Nick Blackburn, PE

-----Original Message-----
From: PFFEI(--nospam--at) [mailto:PFFEI(--nospam--at)]
Sent: Friday, May 12, 2000 3:39 PM
To: seaint(--nospam--at)
Subject: screwed wood diaphragms

are there published values for plywood shear walls and diaphragms
using screws instead of nails?  is it acceptable to use the published
values for screws having similar diameter and embedment ?

paul franceschi s.e.