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Shrinkage of EPDM roof membranes: phenomenon, causes, prevention and remediation

From National Research Council Canada

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Affiliation
  1. National Research Council of Canada. NRC Institute for Research in Construction
  2. National Research Council of Canada
FormatText, Article
ConferenceBuilding Better Roofs : IRC Technical Seminar: 01 September 1996, 11 cities across Canada
Subjectroofs; roofing; Roofs
Abstract
This paper reports on the problem of EPDM membrane shrinkage. Evaluations included NRCA's Project Pinpoint, shrinkage survey data and field research. Also, to further understand the phenomenon, which typically is not catastrophic, three sets of membrane samples were obtained and analyzed: control samples of new EPDM sheets, samples from roofs that exhibited moderate to severe shrinkage problems, and samples from roofs that had no noticeable problems. Evaluation included measuring the glass-transition temperature (as measured by dynamic mechanical analysis), changes in chemical composition (using thermogravimetry), tensile strength and elongation tests, as well as thermally-induced load tests. Generally, the membrane composition and properties were found to not change sufficiently to cause excessive shrinkage. The paper presents conclusions and recommendations for existing roofs, reroofing and new construction.
Publication date
NoteAussi disponible en français: Retrait des membranes de couverture en EPDM: phénomène, causes, mesures préventives ou correctives
LanguageEnglish
Peer reviewedYes
NRC numberNRCC 40627-6
NRC-IRC-17777
NPARC number20377832
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Record identifier287e830b-6347-4651-8711-95a8073f44d7
Record created2012-07-24
Record modified2020-03-20
Date modified: