A tear-off and sheathing inspection requires that the entire existing roof be torn off so that the structure can be assured as acceptable by codes to install another roof.
If there are any damaged surfaces revealed such as rotted plywood, the rotted areas are to be replaced with new plywood. If the truss members are also rotted or broken, they are to be repaired to a condition that exceeds their original state. This is the time when rotted or broken areas of the fascia trim are also required to be replaced and primed for painting.
Once the damaged areas have been repaired and any additional nailing required has been completed, the roofer is to quickly cover the plywood with the underlayment to assure dryness for the night.
The inspector should arrive the next day to sign off on the tear-off and sheathing inspection. He may not climb up on the roof but rather walk around the property observing the structure. He may satisfy himself with asking the roofers if they ran into any problems and what they did to correct them. Once he signs the inspection card he will leave.