Minimum Roof Sheathing Thickness

[Gopher13]

I have a question about the minimum thickness of roof sheathing, and please bear with me, I am self taught on wood design. With reference to the attached tables, it appears as though IBC 2015 limits roof sheathing to 5/8". However, the NDS Supplement diaphragm shear tables only give values up to 19/32" thick? What am I missing? If IBC limits roof sheathing thickness to 5/8", shouldn't the NDS Supplement table start at 5/8" and go up from there (i.e. who cares what the diaphragm shear capacity of 3/8" sheathing if you aren't allowed to use it per IBC)?

 

[BAretired]

I don't have IBC 2015, but would be surprised if the minimum roof deck thickness is limited to 5/8" as 3/8" and 1/2" are quite commonly used.

http://homeguides.sfgate.com/minimum-plywood-roofing-98791.html

BA

 

[chris3eb]

That table is for decks (lumber). The bottom of that page has a table for plywood.

 

[msquared48]

7/16" is the minimum here.

Mike McCann, PE, SE (WA)