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Heavy roofs on older masonry buildings are a deficiency because they

  • A.distribute the seismic force evenly between all the walls of the building
  • B.place a large mass high up on weak walls
  • C.make the building considerably stiffer and so reduce the demand upon its walls
  • D.prevent the walls from cracking during shaking by holding them down firmly

Answer: B

Thick mud or stone roofs generate a large inertia force at the top of walls that have very little capacity to resist it out of plane. Replacing them with a light roof, well tied to the walls, is one of the most effective retrofits available.

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