This document discusses building envelopes and the importance of regular inspections. It defines a building envelope as the physical separator between the indoor and outdoor environments that controls air, water, heat, light and noise. The building envelope includes foundations, roofs, walls, doors, windows, ceilings and related barriers and insulation. Regular inspections allow small issues to be addressed before they become bigger problems and are key to maintaining the integrity of the building envelope. Conducting organized annual inspections should be part of every building manager's maintenance program.