spacing of screw rows over plywood

David Crust
I work with a crew who often installs metal roofing panels on new roofs. The roofs are sheathed with 1/2" or 5/8" plywood and covered with synthetic roofing felt, then steel panels applied over this. My query is considering that the roofing panels are fully supported, unlike a purlined system, can the the frequency of screw rows be further apart than the usual 2" O.C.? I did some online research on this but found all the recommendation were referencing purlin-supported steel panels.
Todd Miller
Isaiah Industries, Inc.
You would need to check with individual roofing panel manufacturers to be certain but I do not believe that using decking reduces the need for fasteners.

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