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Infrared technique as a research tool for measuring water vapor transmission of roofing membranes

From National Research Council Canada

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Affiliation
  1. National Research Council of Canada
  2. National Research Council of Canada. NRC Institute for Research in Construction
FormatText, Article
SubjectRoofing; dry cup method; electronic instrument; infrared (ir) sensor; mylar film; permeance; roofing membranes; water vapor transmission (wvt); water vapor transmission rate (wvtr); wet cup method; Moisture performance; Couvertures
Abstract
Measurements of the permeability to water vapor of materials intended to prevent its transmission are time-consuming with the usual cup method. Several instruments have been promoted as being capable of providing results rapidly, but doubts about their agreement with cup measurements have delayed their use for more than quality control. One instrument with an infrared sensor was studied to investigate its accuracy and to correlate results obtained with the standard cup methods. Factors studied include those that contribute to the inconsistent performance of the instrument, especially for research work. Techniques for improving the precision and the accuracy of the instrument are discussed. The permeances of roofing papers and felts and of plastic films by both the modified IR instrument and the cup methods are reported and compared to values given in the literature.
Publication date
In
  • Journal of Testing and Evaluation 21, no. 3 (May 1993): 199–210.
NoteReprinted in Building Envelope Performance and Durability : IRC technical seminar (NRCC-38991)
LanguageEnglish
Peer reviewedYes
IdentifierIRC-P-2099
NRC numberNRCC 35131
NRC-IRC-2324
NPARC number20374245
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Record identifiereb6ac3da-cb89-42ca-9939-616a5a331cfc
Record created2012-07-23
Record modified2020-06-06
Date modified: