Knowledge Check: Air Leakage and Heat Flow

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Just as heat always flows from hot to cold, air flows from high (positive) pressure areas to a low (negative) pressure areas.

So, for air flow to occur, there must be:

  • A pressure difference between two points
  • A path or opening connecting the points.

Significant heat loss in a building may be the result of air leakage.

AIr leakage and poor insulation at roof and exterior wall junctions can create icicles and ice damming.