Not only does roof maintenance extend the life cycle, it also reduces annual repair costs. Most obvious are the repair costs associated with the roof. However, damages of most concern are the ones that occur to the interior of the building or to the building structure. A building’s envelope (roof and exterior shell) is its first defence. If that is compromised it means that all of the other building systems are put at risk, such as drywall, electrical and flooring. For example, having somebody unplug a clogged drain (maintenance) is relatively inexpensive. While having somebody repair brick and mortar damages that occurred because the water was not drained properly can be extremely expensive.