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Live Webcast: High or Low? Vapor Permeance of Exterior Insulation

RDH Building Science Laboratories

Tuesday, 18 October 2016 from 5:45 PM to 7:15 PM (EDT)

Live Webcast: High or Low? Vapor Permeance of Exterior...

Registration Information

Registration Type Sales End Price Fee Quantity
Webcast - Individual Registration
For individual registrations. Attendance is tracked, and attendees will receive a certificate and AIA credits where applicable.
Ended US$30.00 US$0.00
Webcast - Small Group Registration
This registration is for one login, for one small group (2-4 people) to view together from a single location. It does NOT include certificates or AIA credits (please register as an individual if these are required).
Ended US$30.00 US$0.00

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Event Details

UW BEGHutBoth high- and low-permeance exterior insulation can improve energy efficiency and durability. At the same time, each must be used appropriately to avoid moisture-related issues such as mold. In this presentation, Jonathan Smegal will look specifically at water vapor – how different wall assemblies handle it and how to avoid potential problems in different climate zones. For high-permeance insulation (i.e., mineral wool), the main concern is inward vapor drive; for low-permeance insulation (e.g., XPS, foil-faced polyiso), the concern is trapping water against wood sheathing. Discussion will include examples of current research, specific design details, and building code requirements.

Presenter: Jonathan Smegal


AIA CES logo
 AIA CES Approved!

This presentation is approved for 1.5 AIA CES credits (LU/HSW). Certificates may also be used for self-reported continuing education requirements for many other organizations. 


Learning Objectives:

  1. Understand the building science principles that determine how water vapor moves through wall assemblies.
  2. Identify key research findings related to moisture and durability for high-permeance exterior insulation.
  3. Identify key research findings related to moisture and durability for low-permeance exterior insulation.
  4. Recognize design implications of exterior insulation research in different climate zones.

 Other Details:

  • To receive a certificate or have AIA credits submitted, please register and login as an individual.
  • Live webcasts are time and date specific. If you miss the live event, there will be no refunds. However, a recording of the event will be made available to participants for a limited period. Please see the FAQs for more information.
  • You will receive email instructions to login to the webcast for this event; please ensure that you provide a current email address.
  • Live feed will start a little before the presentation start time of 5:45 and will end at approximately 7:15.

Note: This webcast is also taking place as an in-person event. If you want to register for the webcast, you are on the right page. If you are want to attend in person, please go to the local event page


What are LAB Events?

Learning About Building Science (LAB) Events are monthly training and networking opportunities hosted by Building Science Laboratories. They are interactive, informative, casual events for architects, engineers, and anyone interested in building science. 


More Information:

RDH Building Science Laboratories

167 Lexington Court, Unit 6
Waterloo, Ontario, Canada, N2J 4R9
Phone: (519) 342.4731

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Have questions about Live Webcast: High or Low? Vapor Permeance of Exterior Insulation? Contact RDH Building Science Laboratories



RDH Building Science Laboratories

Building Science Laboratories, a division of RDH Building Science Inc., is committed to expanding building science knowledge through research, education, and collaboration among building science professionals. By promoting sound principles established through research, while working with on-the-ground industry partners, we aim to have a lasting impact on the quality and energy efficiency of the built environment.

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