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Basically, all conservation consists of actions taken to prevent decay, and within this objective it also includes management of change and presentation of the object so that the objects’ messages are made comprehensible without distortion. Architectural conservation is more complex; first because a building must continue to stand up; secondly, economic factors usually dictate that it should remain in use; thirdly, it has to resist and use the effects of climate; and, lastly, a whole team of ‘professionals’ have to collaborate. A professional can be defined as a person who contributes artistically, intellectually or practically to a project | THIRD EDITION Conservation Buildings Bernard M Feilden Conservation of Historic Buildings Frontispiece Ospizio di San Michele Rome Italy before conservation This state of affairs was due to lack of maintenance resulting from planning blight. The rainwater outlets were allowed to become blocked so the gutters overflowed causing rot in the ends of the main beams which in due course collapsed taking the roof structure with .