Lets just say that you get A drawings with rated walls and then duct drawings that show the dampers, but not the wall ratings, a month later.....Now you have to break out the A drawings, get refamiliar to the plan review you did a month ago and try to figure out if it works and then you will end up somehow assigning the responsibility to someone to fix...
Thanks, this clarification helps. The issue appears to be cross-coordination between disciplines. I think there are several approaches instead of requiring all plans at once.
1. Treat the separate mechanical plan check as a "deferred submittal". IBC 107.3.4.1 requires any deferred submittals to first be reviewed by the building RDP for conformance with the design intent, including related building code compliance issues. The building RDP is required to attest they have coordinated it with the original building plan check. In my experience, our attestation has been our "shop drawing stamp".
2. Same as #1, but at time of original plan check / request for deferred approval, your condition of approval includes a standard checklist of items that will require to be shown on the MEP plans. For example: "Indicate all locations where mechanical systems penetrate fire rated assemblies or are enclosed in shafts. Indicate ratings of all dampers and assemblies; indicate their power source and means of actuation. Dimension all proposed exhaust terminations within 10' of any building openings or property lines." Etc.
3. As an architect, this next option is not my favorites, so I'm conflicted about mentioning it: City of LA eliminated IBC 107.3.4.1 "deferred submittals" when they adopted the model code. This requires all deferred submittals as a Modification to the approved cade (similar to IBC 104.10). The building RDP has to make an application (including payment of a fee) and explain how the deferred submittal will still meet all code requirements. Essentially, if you don't have the ready-made checklist in #2, it makes the building RDP generate the checklist of items to be shown on the future deferred submittal. so the city collects a fee just for considering the deferred submittal, then the city collects another plan check fee for the submittal itself. It has actually become a cash cow for the building department, and they have generated so much revenue that they are
under investigation for overcharging customers.
I should clarify that LADBS uses the deferred approval/modification process for things like roof truss shop drawings, elevator shop drawings etc. They actually treat all MEP plans as a completely different plan check, routed to a different plan check engineer, paid with separate plan check fees, and in my experience the MEP plan checkers typically don't review the architectural plans for fire ratings. The field inspectors, however, do look closely and will issue correction notices during construction if the design team failed to coordinate it.
Recently on my accessible dwelling unit architectural plans, I have been showing and dimensioning all outlets and switches at the kitchen elevations. However, I add this note: "Electrical component locations are shown solely to demonstrate dimensional requirements for access compliance per CBC. Electrical components are to be reviewed for electric code compliance under separate electrical plan check/permit."