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Unread 11-26-2017, 01:11 PM   #6
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Join Date: Dec 2015
Location: Berkeley, CA
Posts: 1,097
Originally Posted by Dan
plywood provides the rigidity for the now nearly ubiquitous I joists. Maybe it's the orientation of that ply used in I joists that I'm missing.
The rigidity of an I joist is provided by the top and bottom flanges, which handle the tension and compression forces resulting from bending. The plywood web's job is to provide the vertical separation between the flanges and to handle the shear forces.

Cheers, Wayne
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