Strange roof decking

Did ya see the 7/16 Category stamp I can not make out the 24/16 I see your red square

No, the only vertical application I see in that document is for:

I agree with Barry on the 24/16; 24" o.c. for roof and 16" o.c. for floors but that is in the direction of the strength axis (or the length perpendicular to supports).

That would be the nominal thickness…

Look at note #3 under chart on page 2 of this document:

I don’t know if this is just for Canada…see bottom of page 2… but, I never used it with edges unsupported like in your picture, Charley.

I am with ya thanks

Good one Barry