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Re: Sub diaphragm cross ties

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The use of top flanges to make "cross ties" does not appear to be a good
solution unless there is small tie tension forces.  Typically the joist
manufacturer's have limits to the nail sizes and spacing allowed on their top
flanges.  If the tension can be safely carried with allowable nailing which
includes the diaphragm nails into the flanges you may be ok.  

IMO I would not use the top flanges due to potential splitting and difficulty
in making sure the carpenters would take proper care to get the nailing
correct with diaphragm ply and the metal tie nailing.

Jim Fruit, AIA
Carl Mileff and Associates, Inc.
Building Code Services.