The Impact of Permeance on Condensation in Exterior Wall Assemblies

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Live webinar airing on May 26, 2021 at 2:00 PM EDT
Sponsored by SOPREMA
Presented by Jean-François Côté

Learning Objectives:

  1. Discuss how vapor permeance is measured using standard test method ASTM E96 and why results obtained from procedure A may not be compared to results obtained from procedure B.
  2. Explain why a highly permeable water-resistive barrier/air barrier is not as effective in a wall assembly if the vapor diffusion is restricted by other materials of the assembly.
  3. Understand that for wall assemblies insulated in the stud space only, using water-resistive barriers/air barriers with vapor permeances lower than 5 Perm or higher than 20 Perm increase the risk of condensation and mold growth.
  4. Describe how for split-insulated wall assemblies, the vapor permeance of the water-resistive barrier/air barrier has little or no impact on the hygrothermal performance of the assembly.

Credits:

HSW
1 AIA LU/HSW
IACET
0.1 IACET CEU*
IIBEC
1 IIBEC CEH

This presentation discusses the impact of permeance on condensation in exterior wall assemblies, highlighting the ASTM E96 standard and permeance testing. The presentation also explores the influence of permeance on drying via hygrothermal modeling.

Impact of Permeance


Cote

Jean-François Côté holds a Bachelor’s degree in Chemistry from Université de Sherbrooke and a Ph.D. in Materials Science from INRS-Université du Québec obtained in 1998. He joined SOPREMA in 1999 as a research chemist where he worked on the development of adhesives and sealants used in roofing and civil engineering. In his current role, he represents SOPREMA on technical committees of industry associations (ARMA, PIMA, CIMAC) and is actively engaged in various North American standards development organizations (CSA, ASTM, ULC). He is a registered chemist in the province of Québec (OCQ), is vice-chair of the ASTM D08 Committee on “Roofing and Waterproofing,” and is chair of the CSA A123 technical committee on Roofing Materials.

 

SOPREMA, Inc. SOPREMA offers a comprehensive line of building envelope solutions, combining superior products and systems with decades of proven performance. SOPREMA’s relentless pursuit of technological advancement, sustainability and product quality has been known and respected worldwide for over 100 years.

 

Originally published in May 2021

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