Plywood Roof Diaphragm

[SperlingPE]

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.

 

[msquared48]

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

 

[SperlingPE]

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

 

[msquared48]

Correct, for the appropriate span.

Mike McCann
McCann Engineering