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Project Leader
Sudhakar Molleti
Phone: 613-993-9673
Fax: 613-998-6802
Email: Sudhakar.Molleti@nrc-cnrc.gc.ca
Air Intrusion and Risk of Condensation in Mechanically Attached Roofing Systems
Objectives
- To quantify air intrusion and establish air retarder requirements for mechanically attached roofing systems (MARS)
- To develop an analytical method relating air intrusion and condensation in mechanically attached roofing systems and establish air intrusion limits to be incorporated in building codes.
Background
Air intrusion is a phenomenon that occurs when conditioned indoor air enters into a building envelope assembly but cannot escape to the exterior environment. This phenomenon is common in mechanically attached roofing systems due to billowing of the membrane under the wind dynamics. More precise data about air intrusion is required so that relevant codes and standards can be updated to address this issue.
Statement of Work
- Determine the air permeance of common air retarders used in roofing assemblies
- Quantify air intrusion of common roofing assembly configurations with and without air retarders
- Develop a relation between air intrusion and risk of condensation
Expected Outcomes
- A report summarizing the air permeance of various air retarders, the air intrusion performance of various mechanically attached systems, and an analytical model establishing the limits of air intrusion to minimize risk of condensation.
- Design data tables and recommendations for changes to the building codes regarding air intrusion in mechanically attached roofing systems
Partners
National Roofing Contractors Association, Canadian Roofing Contractors Association, Sika Sarnafil, Carlisle SynTec, Firestone Building Products and Dow Roofing Systems
Start/Expected Completion Dates
This project began in 2009 and will be completed in 2012.
Publications
Air intrusion and its impact on the roofing systems performance
Molleti, S. Baskaran, B.A.
International Conference on Building Envelope, Systems and Technologies (ICBEST)- 2010 (Vancouver, BC, 2010-06-27)
pp. 1-2.
[Full citation / Référence complète]
SIGDERS Air Intrusion Measurements on Mechanically Attached Roofing Systems
Beaulieu, P. Molleti, S. Baskaran, B.A.
Research Report, NRC Institute for Research in Construction, 296
2010-03-29
[Full citation / Référence complète]
How much air is too much? The National Research Council of Canada studies roof system air intrusion
Baskaran, B.A. Molleti, S.
Professional Roofing Magazine,
pp. 27-32. 2010-01-01
[Full citation / Référence complète]
Air intrusion vs. air leakage - the dilemma for low sloped mechanically attached membrane roofs
Baskaran, B.A. Molleti, S.
The Journal of RCI Interface,
pp. 4-10. 2009-11-01
[Full citation / Référence complète]
Air leakage vs. air intrusion in low-sloped roofing assemblies
Molleti, S. Baskaran, B.A. Ko, S.K.P. Beaulieu, P.
12th Canadian Conference on Building Science and Technology (Montréal, Quebec, 2009-05-06)
pp. 567-578.
[Full citation / Référence complète]
Air intrusion vs. air leakage - the dilemma for low sloped mechanically attached membrane roofs
Molleti, S. Baskaran, B.A. Ko, S.K.P. Beaulieu, P.
Proceedings of the Canadian Symposium on Roofing Technology (Toronto, 2009-03- 31)
pp. 1-9. 2009-04-01
[Full citation / Référence complète]
Impact of air intrusion on the wind uplift performance of fully bonded roofing assemblies
Baskaran, B.A. Molleti, S. Sexton, M.
Construction and Building Materials, 23 (2)
pp. 889-901. 2009-02-01
[Full citation / Référence complète]
