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Impact of air leakage on hygrothermal and energy performance of buildings in North America.
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I m pa c t of a ir le a k a ge on hygrot he rm a l a nd e ne rgy pe rform a nc e of buildings in N ort h Am e ric a
I R C - O R A L - 1 0 8 4
M a r e f , W .
M a y 2 0 1 1
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13th Canadian Conference of Building Science and Technology Conference. Workshop, Winnipeg, Manitoba, May 10, 2011, pp. 1-2
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13CCBST WORKSHOP - MAY 10, 2011
Impact of Air Leakage on Hygrothermal and Energy
Performance of Buildings in North America
Dr. Wahid Maref1 and Mr. Mario Goncalves2 1- Senior Research Officer
National Research Council Canada 2- Senior Building Envelope Consultant
Patenaude-Trempe Inc.
The workshop will cover the hygrothermal performance of different wall assemblies. It consists in going from the basic fundamentals of building science to applied research and to the real life “practice”. It will cover laboratory and field assessment of air tightness of building envelope in North America and its effects on energy and hygrothermal performance. An extensive analysis of the energy performance of typical buildings will be presented and layout the importance of air sealing and the impact on energy efficiency for typical wall systems.
The workshop has two parts:
1. From basic and principles to applied research.
2. Commissioning the building envelope for air leakage and thermal anomalies The first part of the workshop will consist in presenting the basic building science principals in how to control heat flow, airflow, moisture flow and other transfer phenomena. Of these control parameters, airflow merits a major consideration mainly because of its influence on heat and moisture flow. How the material and wall assemblies are evaluated for the air barrier following CCMC Air Barrier Guide and/or Standards. This will be followed by a presentation on assessment of wall energy rating (WER) of insulated wall assemblies. Extensive testing program to determine the wall air leakage rate at different differential pressures and their thermal resistance, R-value at different temperature differences will be presented. The objective of this study is to come up with WER number by combining the heat loss due to thermal transmission and that due to air leakage.
A Field monitoring study of interstitial condensation in wood-frame construction in cold climate and energy retrofitted wall systems will be presented.
The second part of the workshop will focus on commissioning the building envelope of large buildings for air leakage and thermal anomalies.
The application of infrared thermography and other diagnostic tools to assess building envelope anomalies in large buildings will be demonstrated through several practical case study examples. All the case study examples are from buildings located in the north-eastern Canada region. Given the harsh winter conditions and temperature variations throughout the year, air leakage and moisture ingress within exterior wall assemblies is a common source of building envelope failures in large buildings.
ABOUT THE PRESENTERS
Dr. Wahid Maref is a Senior Research Officer at the NRC’s Institute for Research in Construction.
Dr. Maref has been involved in building research and applied research for more than 20 years. His expertise is in moisture management in building envelopes. He has solved many hygrothermal designs and has developed multiple design guidelines for various envelope systems. He is responsible for NRC-IRC Risk Management Assessment of Innovative Envelope Systems activity, which includes hygrothermal modeling, laboratory and field-testing.
He is a member of several national and international standards and professional organizations, and provides support on technical issues to the North American construction and related industries.
Dr. Maref is the author of more than 150 technical papers and reports related to moisture in buildings.
Mr. Mario Gonçalves
Mario is a professional engineer and senior building envelope consultant with over twenty years of field experience. He is the President of Patenaude-Trempe - a Montreal and Quebec City based building envelope consulting and testing firm with projects across eastern Canada and the north-eastern United States. Mario also manages the Quebec Building Envelope Council (QBEC) in Montreal and co-chaired the 12th Canadian Conference on Building Science and Technology. His professional practice includes assisting architects with designing building envelopes that perform as well as investigating and field testing performance related problems associated primarily with the vertical building envelope (walls, windows and curtain walls) on mid to high-rise buildings.
