Adhesive rebar anchorage capacity at concrete over metal deck

I have a project that requires a concrete housekeeping pad to be anchorage to the roof concrete over metal deck diaphragm. It is a 2.5" concrete over 3" metal deck (5.5" total). The profis engineering metal deck tool does not have a rebar adhesive option to choose. What is the best way to determine the capacity of the rebar anchorage to the concrete over metal deck.