A metal roof must have screws to hold the metal panels in place. These become loose or back-out with the expansion and contraction of the overtime. This is a sign of age on a metal roof and must be addressed to prolong the life of your roof. Replacement with caulk is first alternative, but a thorough evaluation is necessary to determine, costs, convenience, safety, and appearance concerns. A commercial roofing expert can help determine our best course of action.