BEGIN:VCALENDAR VERSION:2.0 PRODID:-//ChamberMaster//Event Calendar 2.0//EN METHOD:PUBLISH X-PUBLISHED-TTL:P1H REFRESH-INTERVAL:P1H CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/Vancouver BEGIN:DAYLIGHT RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU DTSTART:20070101T000000 TZOFFSETFROM:-0800 TZOFFSETTO:-0700 TZNAME:Pacific Daylight Time END:DAYLIGHT BEGIN:STANDARD RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU DTSTART:20070101T000000 TZOFFSETFROM:-0700 TZOFFSETTO:-0800 TZNAME:Pacific Standard Time END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=America/Vancouver:20260903T073000 DTEND;TZID=America/Vancouver:20260903T120000 X-MICROSOFT-CDO-ALLDAYEVENT:FALSE SUMMARY:Avoiding Double Vapour Barriers: A Fundamental Principle Overshadowed in Some Current Design Practices DESCRIPTION:CPD - 4 credits (TBC)Course Overview:Avoiding double vapour barriers in building assemblies is among the foundational principles of building science. This guidance was reinforced for decades through the education and research conducted by the Division of Building Research at the National Research Council of Canada throughout the 1960s\, 70s\, and 80s\, and captured in publications such as the Canadian Building Digests and reference texts like Building Science for a Cold Climate. This fundamental has long been embedded in Canadian Building Code provisions and remains central to durable\, predictable building‑envelope performance.\nWhile this topic received significant attention historically\, recent years have seen the introduction of various assemblies often configured to meet energy‑efficiency targets that create double‑vapour‑barrier conditions. In many cases\, these configurations have led to performance failures\, compromised long‑term durability\, and nuisance conditions for end users. Forensic reviews confirm that these outcomes are not attributed solely to construction error\; rather\, in many cases\, the underlying issues stem from design decisions.\nThis session revisits the principle of avoiding double vapour barriers by examining its historical context\, highlighting why this "old wisdom" remains crucial for long‑term durability\, and reviewing how it should continue to inform design decisions. Using case studies supported by photos\, videos\, field documentation\, and mobile roof and wall assemblies\, the session will illustrate where design choices have disregarded this principle and will provide practical\, reliable takeaways to support performance\, durability\, and end‑user experience.\nAgenda:7:30 AM - 8:00 AM: Breakfast and Networking8:00 AM - 12:00 PM: Course\nSpeaker:\nHamid Heidarali is a Building Science specialist at HDB with a strong passion for high performance buildings that minimize their impact on the environment\, while providing superior experience for occupants. He has been providing Building Science engineering on a wide range of projects in Canada over the past two decades. Hamid taught building envelope courses to Masters students at British Columbia Institute of Technology (BCIT) from 2015 till 2020\, and offers holistic building envelope workshops for the construction professionals on a regular basis. X-ALT-DESC;FMTTYPE=text/html:
CPD - 4 credits (TBC)

Course Overview:

Avoiding double vapour barriers in building assemblies is among the foundational principles of building science. This guidance was reinforced for decades through the education and research conducted by the Division of Building Research at the National Research Council of Canada throughout the 1960s\, 70s\, and 80s\, and captured in publications such as the Canadian Building Digests and reference texts like Building Science for a Cold Climate. This fundamental has long been embedded in Canadian Building Code provisions and remains central to durable\, predictable building‑envelope performance.

While this topic received significant attention historically\, recent years have seen the introduction of various assemblies&mdash\;often configured to meet energy‑efficiency targets&mdash\;that create double‑vapour‑barrier conditions. In many cases\, these configurations have led to performance failures\, compromised long‑term durability\, and nuisance conditions for end users. Forensic reviews confirm that these outcomes are not attributed solely to construction error\; rather\, in many cases\, the underlying issues stem from design decisions.

This session revisits the principle of avoiding double vapour barriers by examining its historical context\, highlighting why this &ldquo\;old wisdom&rdquo\; remains crucial for long‑term durability\, and reviewing how it should continue to inform design decisions. Using case studies supported by photos\, videos\, field documentation\, and mobile roof and wall assemblies\, the session will illustrate where design choices have disregarded this principle and will provide practical\, reliable takeaways to support performance\, durability\, and end‑user experience.


Agenda:

7:30 AM - 8:00 AM: Breakfast and Networking

8:00 AM - 12:00 PM: Course


Speaker:


Hamid Heidarali is a Building Science specialist at HDB with a strong passion for high performance buildings that minimize their impact on the environment\, while providing superior experience for occupants. He has been providing Building Science engineering on a wide range of projects in Canada over the past two decades. Hamid taught building envelope courses to Masters students at British Columbia Institute of Technology (BCIT) from 2015 till 2020\, and offers holistic building envelope workshops for the construction professionals on a regular basis.

LOCATION:5888 Trapp Avenue Burnaby BC V3N 5G4 UID:e.2456.1375710 SEQUENCE:3 DTSTAMP:20260619T152358Z URL:https://members.havan.ca/meetings/Details/avoiding-double-vapour-barriers-a-fundamental-principle-overshadowed-in-some-current-design-practices-1624040?sourceTypeId=Hub END:VEVENT END:VCALENDAR