Rain Penetration of the Window-Wall Joint

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SubjectAir and vapour barriers; Rainscreen walls; Moisture performance
AbstractRain penetration through construction joints is a major concern in Atlantic Canada, and it has been suggested that the Canadian Construction Research Board (CCRB) Nova Scotia Chapter examine the issue as part of Chapter activities. Solutions to rain penetration problems have centered on controlling the forces which drive water through the wall and into the building. Rain screen joints and walls with a separate continuous air barrier system should be installed in new buildings. Applying external caulking (face-sealing) to serve as both rain deflector and air barrier is a poor practice, and may actually compound rather than solve wall/window leakage problems. Attention should be paid to wall and joint details such as flashing during the design and construction stages to prevent poor installation habits from persisting.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
NotePrepared for Canadian Construction Research Board, Nova Scotia Chapter - Reprinted in Building Envelope Performance and Durability : IRC technical seminar held in 11 cities across Canada February through March 1995 ( NRCC-38991)
Peer reviewedNo
NRC number38747
NPARC number20358929
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Record identifierfc030c42-849a-43bc-bec2-71a5a7446c82
Record created2012-07-20
Record modified2016-05-09
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