A roof system can be installed on a new or existing building.
Roofing a new building is called new construction. An entire roof assembly is installed from the deck up. When a roof system is installed on a building that already has a roof, it is called reroofing.
Sometimes, a new roof membrane can be installed over an existing one. This is called a re-cover. A new membrane is installed on top of the existing one after the surface is prepared. When an existing roof system has to be removed, it is called a tear-off (see picture). Equipment and machinery can usually be used to help with this kind of work.
The old material can be thrown away. Sometimes, a deck needs to be repaired before a new roof system is installed.
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