Wang, Ruolin (2019) Attic Ventilation in Extremely Cold Climate - Field Measurements and Hygrothermal Simulation. Masters thesis, Concordia University.
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Abstract
Attic ventilation is typically recommended for the removal of moisture build-up caused by air leakage from indoors in cold climates, however, it may also increase the amount of snow and rain penetration into the attic, especially in the extremely cold climates. In northern regions, extremely cold temperatures can cause snow particles to become very fine, which will penetrate vents or unsealed openings. The snow accumulated in the attic would melt at temperatures above zero and penetrate to indoors through the ceiling and cause moisture problems. One of the solutions is to add filter membranes along a ventilation cavity behind the façade to prevent snow from entering the attic. The ventilated attics with filter membrane had some success but there were instances with reported water leakages and moisture damages. There have been also attempts to use un-ventilated cold roofs. Un-ventilated attics prevent snow accumulation but do not allow for effective removal of moisture, which could be risky and prone to moisture damages.
In this thesis, three houses in northern Canada are investigated, two of them have ventilated attics with different filter membrane designs located in Kuujjuaq and another has un-ventilated attic located in Iqaluit. Field measurements are setup in these three houses to monitor their hygrothermal performance under different venting systems. Measured results indicate ventilated attic has reasonable hygrothermal conditions which moisture content level on attic sheathing is under 20% and un-ventilated attic has higher risk of moisture problems. At the same time, hygrothermal modelling using WUFI Plus, a whole-building hygrothermal simulation software, are performed and simulation results are compared with measurements for model validation. Validated models are also performed in other location to further verify their universality. Attic ventilation rate, air leakage rate, un-intentional air infiltration rate and indoor conditions are set as variable parameters in WUFI Plus to discuss their effect on the hygrothermal performance of attics.
This thesis is intended to provide documented evidence of the hygrothermal performance of ventilated and un-ventilated attics in extremely cold climate. Simulation models validated by field measurements can be used under other climates. Recommendations on proper attic design are provided for Canadian northern housing.
| Divisions: | Concordia University > Gina Cody School of Engineering and Computer Science > Building, Civil and Environmental Engineering |
|---|---|
| Item Type: | Thesis (Masters) |
| Authors: | Wang, Ruolin |
| Institution: | Concordia University |
| Degree Name: | M.A. Sc. |
| Program: | Building Engineering |
| Date: | 31 March 2019 |
| Thesis Supervisor(s): | Ge, Hua |
| Keywords: | attic ventilation, hygrothermal simulation, extreme cold climates, moisture, wood frame construction, mold growth index |
| ID Code: | 985365 |
| Deposited By: | Ruolin Wang |
| Deposited On: | 17 Jun 2019 18:47 |
| Last Modified: | 17 Jun 2019 18:47 |
References:
Alaska Housing Finance Corporation. (2002). Alaska Housing Manual: 4th Edition (pp. 55-60). Anchorage, United States of America. Retrieved from https://www.ahfc.us/files/9913/5716/0257/housing-manual-4th.pdfAl-Obaidi, K. M., Ismail, M., & Rahman, A. M. A. (2014). A review of the potential of attic ventilation by passive and active turbine ventilators in tropical Malaysia. Sustainable Cities and Society, 10, 232-240.
American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). (2010). ASHRAE/IES Standard 90.1-2010: Energy standard for buildings except low-rise residential buildings. Atlanta, GA: American Society of Heating, Refrigeration and Air-Conditioning Engineers.
American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). (2013). 2013 ASHRAE handbook: Fundamentals. Atlanta, GA: American Society of Heating, Refrigeration and Air-Conditioning Engineers.
American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). (2010). ASHRAE/IES Standard 62.1-2010: Ventilation for acceptable indoor air quality. Atlanta, GA: American Society of Heating, Refrigeration and Air-Conditioning Engineers.
American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). (2013). ASHRAE/IES Standard 55-2013: Thermal environmental conditions for human occupancy. Atlanta, GA: American Society of Heating, Refrigeration and Air-Conditioning Engineers.
Anderson, J. D. (2005). Ludwig Prandtl’s boundary layer. Physics Today, 58(12), 42-48.
Antretter, F., Sauer, F., Schöpfer, T., & Holm, A. (2011, November). Validation of a hygrothermal whole building simulation software. In Proceedings of Building Simulation 2011: 12th Conference of International Building Performance Simulation Association, Sydney, Australia (Vol. 14, p. 16).
Arfvidsson, J., & Harderup, L. E. (2005). Moisture safety in attics ventilated by outdoor air. In 7th Symposium on Building Physics in the Nordic Coutries (Vol. 1, pp. 149-156). The Icelandic Building Research Institute.
Baril, D., Fazio, P., & Rao, J. (2013). Field study of hygrothermal performance of housing in Canadian North. In EIC Climate Change Technology Conference (pp. 1-2).
Barth, L. (2015, March 5). Benefits of Proper Attic Ventilation [Blog post]. Retrieved from http://blog.gaf.com/benefits-of-proper-attic-ventilation/
Birkbeck, P. (2017, October 17). Making a case for sprayfoam in the unvented attic [Webpage post]. Retrieved from https://www.constructioncanada.net/making-case-sprayfoam-unvented-attic/
Blom, P. (2001). Venting of attics and pitched, insulated roofs. Journal of Thermal Envelope and Building Science, 25(1), 32-50.
Bolton, K., Lougheed, M., Ford, J., Nickels, S., Grable, C., & Shirley, J. (2011). What we know, don’t know, and need to know about climate change in Inuit Nunangat: A systematic literature review and gap analysis of the Canadian Arctic. Ottawa: Inuit Tapiriit Kanatami. Retrieved from http://www.inuitknowledge.ca/sites/ikc/files/attachments/ITK_ClimateChange.pdf
Browne, F.L. 1933. Some causes of blistering and peeling paint on house siding. Madison, Wis.: Forest Products Laboratory F6.
Buchan, L. Parent Ltd. (1991). Survey of Moisture Levels in Attics: Final Report. Ottawa, Canada: Canada Mortgage and Housing Corporation (CMHC).
Building Officials' Conference of America Inc. (1948). Abridged Building Code. New York, United State of America: Building Officials Conference of America Inc.
Burch, D. M., & Treado, S. J. (1979). Ventilating residences and their attics for energy conservation. Summer attic and whole-house ventilation, NBS Special Publication, 548, 73-104.
California Energy Commission. (2013). Building Energy Efficiency Standards for Residential and Nonresidential Buildings. California Energy Commission.
Canada Mortgage and Housing Corporation (CMHC). (1999). Attic Ventilation and Moisture. Research & Development Highlights: Technical Series 93-201. Ottawa, Canada. Retrieved from http://publications.gc.ca/collections/Collection/NH18-22-93-201E.pdf
Canada Mortgage and Housing Corporation (CMHC). (1999). Attic Venting, Attic Moisture and Ice Dams. About Your House Series: CE 19. Ottawa, Canada. Retrieved from http://publications.gc.ca/collections/Collection/NH18-24-13E.pdf
Cleary, P., & Sonderegger, R. (1987). A method to predict the hour-by-hour humidity ratio of attic air. In Thermal Insulation: Materials and Systems. ASTM International.
Comiso, J. C., & Hall, D. K. (2014). Climate trends in the Arctic as observed from space. Wiley Interdisciplinary Reviews: Climate Change, 5(3), 389-409.
Cornick, S. M. (2005, July 7). Task 3: Report on Task 3: Extreme Canadian Climates – Northern and Coastal (NRC Publication: No. B-1239.3). National Research Council Canada. Retrieved from https://nparc.nrc-cnrc.gc.ca/eng/view/fulltext/?id=2c2ae705-ab7b-483c-b939-a77587214c42
Covestro LLC. (2016). Unvented Attic Design & Construction. Spring, United States of America. Retrieved from https://sweets.construction.com/swts_content_files/153465/2297516.pdf
Cyphers, R., Wagner, C., & Knorowski, J. (2017). Development of Standards to Evaluate, Analyze, and Retrofit Mass Wall Assemblies and Steep Sloped Roof Assemblies of Existing Buildings for Compliance with Energy Codes. In Advances in Hygrothermal Performance of Building Envelopes: Materials, Systems and Simulations. ASTM International.
Dell, M. (2015, April 7). Re-thinking ventilated attics: how to stop mold growth in coastal climates. Retrieved from https://www.rdh.com/research/re-thinking-ventilated-attics-how-to-stop-mold-growth-in-coastal-climates/
Duncan, R. (2017). Computer Simulation of Peak Temperatures in Spray Polyurethane Foam Used in Residential Insulation Applications. In Developing Consensus Standards for Measuring Chemical Emissions from Spray Polyurethane Foam (SPF) Insulation. ASTM International.
Essah, E. A., Sanders, C. H., Baker, P., & Kalagasidis, A. S. (2009). Condensation and moisture transport in cold roofs: effects of roof underlay. Building Research & Information, 37(2), 117-128.
Ford, J. K. (1982). Heat flow and moisture dynamics in a residential attic. Princeton University, Center for Energy and Environmental Studies.
Forest, T. W., & Walker, I. S. (1992, December). Attic ventilation model. In Proc. ASHRAE/DOE/BTECC 5th Conf. on Thermal Performance of Exterior Envelopes of Buildings (pp. 399-408).
Fugler, D. W. (1999). Conclusions from ten years of Canadian attic research. ASHRAE Transactions, 105, 819.
Ge, H., Wang, R., & Baril, D. (2018). Field measurements of hygrothermal performance of attics in extreme cold climates. Building and Environment, 134, 114-130.
Gullbrekken, L., Kvande, T., Jelle, B. P., & Time, B. (2016). Norwegian Pitched Roof Defects. Buildings, 6(2), 24.
Gullbrekken, L., Uvsløkk, S., Kvande, T., Pettersson, K., & Time, B. (2018). Wind pressure coefficients for roof ventilation purposes. Journal of Wind Engineering and Industrial Aerodynamics, 175, 144-152.
Hagentoft, C. E., & Kalagasidis, A. S. (2010). Mold growth control in cold attics through adaptive ventilation: Validation by field measurements. In 11th International Conference on Thermal Performance of the Exterior Envelopes of Whole Buildings, Buildings XI; Sheraton Sand Key Resort in Clearwater BeachClearwater; United States; 5 December 2010 through 9 December 2010.
Holm, A., & Künzel, H. M. (2003). Two-dimensional transient heat and moisture simulations of rising damp with WUFI 2d. In Research in Building Physics: Proceedings of the 2nd International Conference on Building Physics, 14–18 September 2003, Antwerp, Belgium (pp. 363-67).
Hukka, A., & Viitanen, H. A. (1999). A mathematical model of mould growth on wooden material. Wood Science and Technology, 33(6), 475-485.
Hutchinson, T. W. (2017). Ventilation of Low Slope Roof Systems in Northern Climates. Energy Procedia, 132, 411-416.
Icynene Inc. (2013). Benefits of the Unvented Attic Assembly. Mississauga, Canada. Retrieved from https://www.icynene.com/fbdocs/BenefitsoftheUnventedAtticAssemblyApr2013.pdf
Iffa, E., & Tariku, F. (2015). Attic baffle size and vent configuration impacts on attic ventilation. Building and Environment, 89, 28-37.
International Code Council. (2014). International residential code 2015: for one- and two-family dwellings. Falls Church, Va.: International Code Council.
International Code Council. (2017). 2018 International building code. Falls Church, Va.: International Code Council.
Kativik Regional Government and Makivik Corporation. (2010). Plan Nunavik. Westmount, Canada: Avataq Cultural Institute. Retrieved from http://www.krg.ca/images/stories/docs/Communiques_en/Plan_Nunavik_06_20.pdf
Kayello, A., Ge, H., & Athienitis, A. (2017). Attic ventilation in northern Canadian climates. In Proceedings of 15th Canadian Conference on Building Science and Technology 2017.
Kelechava, B. (2017, November 14). 2018 International Building Code (ICC IBC-2018) [Blog post]. Retrieved from https://blog.ansi.org/2017/11/2018-international-building-code-icc-ibc/#gref
Khan F., Dery S., Menzies D. (2010). A pilot study to investigate the association of the home environment with occurrence of lung disease in the Inuit population of Nunavik. Kuujjuaq Air Quality Study.
Künzel, H. M. (1994). Verfahren zur ein-und zweidimensionalen Berechnung des gekoppelten Wärme-und Feuchtetransports in Bauteilen mit einfachen Kennwerten (Doctoral dissertation, Universität Stuttgart).
Kurkinen, K. (2017). Case Study of a Cold Attic in a Pitched Roof with Minimal Ventilation. Energy Procedia, 132, 466-471.
Lstiburek, J. (2006). Understanding attic ventilation. ASHRAE Journal, 48(4), 36-38,40,42-45. Retrieved from https://search.proquest.com/docview/220461788?accountid=10246
Lstiburek, J., & Carmody, J. (1994). Moisture control handbook: principles and practices for residential and small commercial buildings. John Wiley & Sons.
Meloysund V, Blom P, Bohlerengen T, LianField M. (2012). Investigation of Un-ventilated Cold Attics. In Proceedings of Building Enclosure Science and Technology Conference (BEST3). Atlanta, GA, USA.
National Republican Congressional Committee (NRCC). (1997). Model National Energy Code of Canada for Buildings 1997. Ottawa, ON: National Research Council of Canada.
Ojanen, T., Viitanen, H., Peuhkuri, R., Lähdesmäki, K., Vinha, J., & Salminen, K. (2010). Mold growth modeling of building structures using sensitivity classes of materials. Proceedings Buildings XI. Florida, USA.
Owens Corning Roofing and Asphalt LLC. (2015). Fundamentals in Roofing Ventilation and Ventilation Applications. Toledo, USA. Retrieved from https://www.owenscorning.com/NetworkShare/Roofing/10013807-Ventilation-Training-Manual.pdf
Pallin, S. B., Boudreaux, P. R., & Jackson, R. K. (2014). Indoor climate and moisture durability performances of houses with unvented attic roof constructions in a mixed-humid climate (No. ORNL/TM--2014/549). Oak Ridge National Lab.(ORNL), Oak Ridge, TN (United States). Building Technologies Research and Integration Center (BTRIC).
Parker, D. S. (2005). Literature review of the impact and need for attic ventilation in Florida homes. Florida Solar Energy Center Report FSEC-CR-1496-05.
Prowse, T. D., Furgal, C., Bonsal, B. R., & Edwards, T. W. (2009). Climatic conditions in northern Canada: past and future. Ambio, 257-265.
Roppel, P., Norris, N., & Lawton, M. (2013, December). Highly insulated, ventilated, wood-framed attics in cool marine climates. In Proceedings of the ASHRAE Buildings XII Conference.
Rose, W. B. (1995, December). The history of attic ventilation regulation and research. In Thermal Performance of the Exterior Envelopes of Buildings, VI: Proceedings of American Society of Heating, Refrigeration and Air-Conditioning Engineers (ASHRAE) Conference (pp. 4-8).
Rose, W. B., & TenWolde, A. (2002). Venting of attics & cathedral ceilings. ASHRAE Journal, 44(10), 26-33.
Rowley, F. B., Algren, A. B., Lund, C. E. (1941). Condensation of Moisture and its Relation to Building Construction and Operation. University of Minnesota. Retrieved from the University of Minnesota Digital Conservancy, http://hdl.handle.net/11299/124254
Rudd, A. (2005). Field performance of unvented cathedralized (UC) attics in the USA. Journal of Building Physics, 29(2), 145-169.
Rudd, A. F., Lstiburek, J. W., & Ueno, K. (2000). Unvented-cathedralized attics: Where we’ve been and where we’re going. Proceedings ACEEE Summer Study on Energy Efficiency in Buildings, Pacific Grove, CA, 1, 1247-1259.
Samuelson, I. (1998). Hygrothermal performance of attics. Journal of Thermal Envelope and Building Science, 22(2), 132-146.
Schumacher, C. (2007). Unvented Roof Assemblies for All Climates (BSD Publication No.149). Retrieved from https://buildingscience.com/documents/digests/bsd-149-unvented-roof-assemblies-for-all-climates
Schumacher, C. J. (2008). Hygrothermal performance of insulated, sloped, wood-framed roof assemblies (Master's thesis, University of Waterloo).
Schumacher, C. J., & Reeves, E. (2007, August). Field Performance of an Unvented Cathedral Ceiling (UCC) in Vancouver. In Thermal Performance of the Exterior Envelopes of Whole Buildings X International Conference (pp. 2-7).
Smegal, J., Straube, J., Grin, A., & Finch, G. (2017). State of the art review of unvented sloped wood-framed roofs in cold climates. In 15th Canadian Conference on Building Science and Technology.
Statistics Canada. (2008). Aboriginal peoples in Canada in 2006: Inuit, Métis and first nations, 2006 census. Ottawa, Canada. Retrieved from http://www12.statcan.ca/census-recensement/2006/as-sa/97-558/pdf/97-558-XIE2006001.pdf
Straube, J., Smegal, J., Smith, J. (2010). Moisture-safe unvented wood roof systems (BA Report No.1001). Westford, United States of America: Building Science Corporation. Retrieved from https://buildingscience.com/documents/bareports/ba-1001-moisture-safe-unvented-wood-roof-systems/view
TenWolde, A., & Rose, W. B. (1999). Issues related to venting of attics and cathedral ceilings. TRANSACTIONS-AMERICAN SOCIETY OF HEATING REFRIGERATING AND AIR CONDITIONING ENGINEERS, 105, 851-857.
The National Aboriginal Economic Development Board. (2015). The Aboriginal Economic Progress Report. Gatineau, Canada. Retrieved from http://www.naedb-cndea.com/reports/NAEDB-progress-report-june-2015.pdf
Thirunavukarasu, A. (2016). Protocol for Low Energy Houses for Northern Canadian Regions (Master's thesis, Concordia University).
Ueno, K., & Lstiburek, J.W. (2016, December). Monitoring of two unvented roofs with air-permeable insulation in climate zone 2A. In ASHRAE Thermal Performance of the Exterior Envelopes of Whole Building XI International Conference. Florida, USA.
United States Environmental Protection Agency. (2013). Moisture Control Guidance for Building Design, Construction and Maintenance. Washington, United States of America. Retrieved from https://www.epa.gov/sites/production/files/2014-08/documents/moisture-control.pdf
Walker, A. (2016, February 2). Natural Ventilation [Blog post]. Retrieved from http://www.wbdg.org/resources/natural-ventilation?r=env_wall_eifs
Walker, I. S., & Forest, T. W. (1995). Field measurements of ventilation rates in attics. Building and Environment, 30(3), 333-347.
World Meteorological Organization. (1989). Calculation of monthly and annual 30-year standard normals (WMO/TD-No. 341). Geneva, Switzerland.
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