Quantification of air leakage effects on the condensation resistance of windows

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TypeArticle
Journal titleASHRAE Transactions
Volume109
Issue1
Pages600606; # of pages: 7
SubjectMoisture performance
AbstractWindows are rated for their different performance parameters so that they could be evaluated either for adequacy to perform in specific applications, or to meet certain requirements. The rating of fenestration products also provides a means to compare products for selection purposes.Test methods are already established to determine almost all the performance factors to assess window characterization in controlled environment. However, there is some disagreement about the testing protocol of windows for condensation resistance. There is a debate on whether windows should be tested with sealed or unsealed cracks.This paper provides a discussion on how air leakage through the cracks can affect the test results when testing windows for condensation resistance. The intent is to determine the effects of the window design and the selection of components, such as weather-stripping, hardware and other components, on its condensation resistance. These effects would be masked when the cracks are sealed to prevent cold air from flowing through them, and hence changing the test results. This paper also provides test data to confirm the notion that when testing windows for condensation resistance, they should be tested without sealing any cracks in the assembly other than the interface between the window and the surround panel where it is installed.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number45214
14276
NPARC number20378866
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Record identifier7cc39ee2-77ec-44b7-8ed3-59d95b751c33
Record created2012-07-24
Record modified2016-05-09
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