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Plywood Roof Diaphragm

Plywood Roof Diaphragm

Plywood Roof Diaphragm

(OP)
In the IBC, what is the maximum spacing allowed to reach the table values for allowable diaphragm loads (table 2306.4.1) for members supporting the plywood diaphragm?  I have it in my head that it is 24" o.c.

RE: Plywood Roof Diaphragm

The span can be taken to 48" on center for supporting members, but the plywood thickness would have to increase.  Look at Table 2306.3.1, note "b".

Mike McCann
McCann Engineering

RE: Plywood Roof Diaphragm

(OP)
Where do you go for plywood vertical load carrying capacity?  Do you use the IBC values?

RE: Plywood Roof Diaphragm

Correct, for the appropriate span.

Mike McCann
McCann Engineering

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