Rooftop penetrations can include any vents, hatches, stacks, skylights, and HVAC equipment penetrations on your roof. Again, you will need to determine the specific order of which penetrations you will inspect first, or your path across the rooftop.
While inspecting these, ensure that any condensation from HVAC units is moving to drains properly. Check all rain caps on stacks to ensure they still keep the weather out of the stacks. You should check all seams in roof units to ensure they are watertight, and then check the area surrounding rooftop penetrations to make sure there hasn’t been any damage to the roof surface during installation or repairs.