Interventions in existing buildings should use equally durable building materials. Don’t mix short-term materials with long-term materials. Materials that deteriorate more quickly than the original building fabric require further interventions and decrease the service life of a building. Building designs should either include components with similarly long service lives or be designed for disassembly for replacement of the shorter life components. Redundant systems provide backup in the event that a primary system fails and allow a building to continue to function.