Moisture accumulation in walls due to air leakage

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ConferenceRilem/CIB Symp. Moisture Problems in Buildings Preprint 2-9: 1965, Helsinki, Finland
Subjectair moisture transfer; air leakages; walls; condensation; Moisture performance
AbstractA number of cases of water and frost damage in masonry and non-loadbearing walls have been examined. Consideration of the weather conditions and the location and pattern of failure has shown that the quantities of water involved could not have resulted from vapour diffusion or rain penetration, and that condensation due to exfiltration of air was the primary source of moisture. Air exfiltrates through the many cracks and joints common to all present methods of construction. In winter, the water vapour contained by the air is cooled below its dewpoint temperature at some point in the wall and condensation occurs. The pattern and magnitude of building pressure differences inducing exfiltration and the concomitant air and moisture transfer are discussed in this paper. Some examples of related building failures are then described.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number9131
NPARC number20359000
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Record identifieraebbca87-8deb-4f03-9ca9-ba27712f9297
Record created2012-07-20
Record modified2016-05-09
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