Seasonal variation in air tightness of two detached houses

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ConferenceMeasured Air Leakage of Buildings: 02 April 1984, Philadelphia, PA, USA
Pages1732; # of pages: 16
Subjectair tightness; air leakages; wood frame construction; vapor barriers; moisture content; air leakage; measurement; pressure; fan; weather; residential; Air and vapour barriers; etanchéité à l'air; pénétration de l'air; construction à ossature de bois; pare vapeur; dégré hygrométrique
AbstractFan pressurization tests on two unoccupied houses were conducted once every two weeks for a period of a year (May 1982 to July 1983) to determine the seasonal variation in airtightness. Both houses are of insulated wood frame construction. House No. 1 was built with more insulation than is required by the local building code, and a polyethylene vapor barrier was applied with special care to improve its airtightness. House No.2, a less air tight house, was built with various wall construction features and a polyethylene vapor barrier in only two walls. Indoor relative humidity, indoor and outdoor air temperatures, and moisture content of the stud and top plates of the wood framing were measured at the time of airtightness testing to determine whether a correlation exists between these factors and house airtightness. The results indicate that air leakage varies throughout the year, with the minimum value in late summer and fall and the maximum value in winter and early spring. The difference is more pronounced in the leakier house. There is also indication of a rough correlation between envelope airtightness and indoor humidity ratio.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number26402
NPARC number20377601
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Record identifiere92b30b2-3197-40af-87b8-c853523d0558
Record created2012-07-24
Record modified2016-05-09
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