AIVC - Air Infiltration and Ventilation Centre

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Air leakage in buildings

Wilson A.G., 1961
air infiltration | air leakage | condensation
Bibliographic info: National Research Council Canada, Division of Building Research, digest no.23
Languages: English

Examines ways in which air leakage affects building performance. Heating load and building relative humidity in winter are affected by over-all air infiltration and ventilation rates. Windows and doors usually represent the major source of air leakage in buildings. Condensation problems occur when exfiltrating air deposits moisture on surfaces such as atticsand inside double windows. Discusses ways of reducing condensation. Finds that air tightness in inside of enclosure must always be many times greater than that of the outer cladding. In multi-storey buildings, air flow between floors should be restricted to reduce pressure differences resulting from chimney action.


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