As a roof expands and contracts the roof system moves. This is a daily occurrence and is associated with Thermal Shock. During movement the metal panels bind against each other. Sometimes a tree branch or flying debris may impact the roof causing damage. 3rd party damage is another issue. As people walk across the roof they can cause damage. The metal panels on this Lebanon roof have been damaged. Since this leaves the underlayment showing, it is our recommendation these areas are repaired.