Deterioration happens to most physical components that are part of reserve fund planning.
The initial types refer to design and/or installation flaws and these set the stage.
The on-going types relate to physical forces, water, pests, pollutants, light and exposure to the elements.
Contract exclusions and consultant, engineer and trade neglect are part-and-parcel of accelerated deterioration.
Operating maintenance issues and lack of inspections also increase the process.
Thievery, vandalism and occupant modifications also influence the condition and the effective age of components.