Moisture Performance of an Airtight, Vapor-permeable Building Envelope in a Cold Climate

Author:

Simonson Carey J.1,Ojanen Tuomo2,Salonvaara Mikael3

Affiliation:

1. Department of Mechanical Engineering, University of Saskatchewan, 57 Campus Dr. Saskatoon, SK, S7N 5A9

2. VTT Building and Transport, Materials and Products, P.O. Box 1804, Fin – 02044 VTT, Finland

3. VTT Building and Transport, Materials and Products, P.O. Box 1804, Fin – 02044 VTT, Finland; Syracuse University, Syracuse, NY, USA

Abstract

Vapor-permeable building envelopes have received renewed interest because they can moderate indoor humidity levels and improve the drying of the envelope during summer condensation conditions. In this paper, the moisture performance of a vapor-permeable building envelope is presented with field measurements and numerical simulations. The results show that the diffusion resistance of the internal surface should be greater than that of the external surface (typically recommended ratio of 3: 1 or 5: 1), but that the vapor resistance of the vapor retarder can be significantly below that provided by polyethylene and still result in a safe structure, even in a cold climate.

Publisher

SAGE Publications

Subject

Fluid Flow and Transfer Processes,Mechanics of Materials,General Materials Science,Building and Construction

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