Evaluating Wall-Window Interface Details for Risk of Condensation on Box and Flanged Windows

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DOIResolve DOI: http://doi.org/10.4224/20386697
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TypeTechnical Report
Series titleResearch Report, NRC Institute for Research in Construction; Volume 319
Physical description202 p.
SubjectHygrothermal properties; Walls
AbstractThe development of alternative details to manage water intrusion at the wall-window interface has produced a number of novel approaches to detailing the interface between the window and adjacent wall assembly. Many of these approaches advocate the need to provide drainage at the rough opening of the window subsill given that the window components themselves are susceptible to water entry over their expected life. Depending on the types of windows used and the cladding into which the windows are installed, there arise different methods to provide drainage that may also affect air leakage through the assembly. This in turn may give rise to the formation of condensation along the window at the sill or along the window sash and glazing panels. Hence there is a need to determine if, under cold weather conditions, specific interface details that incorporate sill pans provide potential for condensation on the window components in which air leakage paths may be prominent at the sill or elsewhere on the window assembly. The report provides information on a laboratory evaluation of conditions that could result in the formation of condensation at the window frame perimeter of the interface assembly as a function of both temperature deferential and air leakage rate across the test assembly. The laboratory test protocol is provided that includes a description of the test set-up and apparatus, fabrication details of the specimen and information on instrumentation and calibration. The experimental results for flanged and box windows are each discussed in turn. Included in the results is a preliminary analysis based on thermal simulation of the window frame in which experimental results are presented and compared to those obtained from simulation undertaken using a commercially available thermal software.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number21811
NPARC number20386697
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Record identifier6f0730b3-0c57-4f05-95cc-412483c176eb
Record created2012-07-25
Record modified2016-10-03
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