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A thermal bridge in an envelope is a path of

  • A.higher resistance that blocks the heat flow
  • B.air leakage through the construction
  • C.moisture movement into the insulation
  • D.higher conductance that bypasses the insulation

Answer: D

A concrete slab edge, a steel lintel or a balcony carried through the wall lets heat past the insulation and may cost a substantial share of the notional performance. It also creates a cold spot where condensation and mould follow.

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