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A cavity wall performs better than a solid wall of the same thickness because the cavity

  • A.allows moisture to drain from the wall
  • B.increases the wall's thermal capacity
  • C.adds a resistance of trapped air
  • D.reduces the mass of the construction

Answer: C

Still air is a good insulant, and an unventilated cavity adds perhaps 0.18 to the resistance before any insulation is put in it. Filling the cavity multiplies that severalfold, which is the commonest retrofit on such a wall.

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