What is Re-roof?

Re-roof definition and meaning on Dictionary terms:
noun, plural roofs.

the external upper covering of a house or other building.
a frame for supporting this: an open-timbered roof.
the highest part or summit: The Himalayas are the roof of the world.
something that in form or position resembles the roof of a house, as the top of a car, the upper part of the mouth, etc.
a house.
Mining. the rock immediately above a horizontal mineral deposit.