garage firewall

garage fire wall 5/8 sheetrock fire taped

How do you know it is 5/8 and not 1/2 ? Were there visible markings?

Looks like it may be visible at the door jamb.

What is the OP’s question?

It is a fire separation unless it has a UL design for a fire rated wall.

Another student posting his observation for a course in the wrong section.