Assessment of Energy Rating of Polyurethane Spray Foam Walls: Procedure and Interim Results

    Volume 6, Issue 9 (October 2009)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 29 October 2009

    Page Count: 12


    Maref, W.
    National Research Council Canada-Institute for Research in Construction (NRCC-IRC), Ottawa, ON

    Elmahdy, H.
    National Research Council Canada-Institute for Research in Construction (NRCC-IRC), Ottawa, ON

    Swinton, M. C.
    National Research Council Canada-Institute for Research in Construction (NRCC-IRC), Ottawa, ON

    Tariku, F.
    National Research Council Canada-Institute for Research in Construction (NRCC-IRC), Ottawa, ON

    (Received 23 July 2008; accepted 30 June 2009)

    Abstract

    The application of polyurethane spray foam (SPF) insulation in buildings provides a durable and efficient thermal barrier. The industry is also promoting the SPF as an effective air barrier system in addition to its thermal insulation characteristics. In an effort to address these issues, a consortium of SPF manufacturers and contractors, jointly with the National Research Council of Canada’s Institute for Research in Construction conducted an extensive research project to assess the thermal and air leakage characteristics of SPF walls as well as conventional wall assemblies. The objective is to develop analytical and experimental procedures to determine a wall energy rating (WER) that captures both the thermal and airleakage performance of a wall assembly. The experimental part included two streams of testing: (1) To determine the wall air leakage rate at different conditions and (2) their thermal resistance, R-value, at different temperature differences. An analytical procedure was also developed to calculate WER by combining the heat loss due to thermal transmission and that due to air leakage with the aim of arriving at WER. Six conventional full-scale wood frame wall assemblies were built, two with glass fiber batts and of four with medium density SPF. Some walls were constructed without penetrations and others were built with penetrations. The testing regime included: (i) Initial testing of air leakage and thermal resistance; (ii) conditioning in the dynamic wall test facility according to an established routine; and (iii) retesting for air leakage and thermal resistance. This paper presents the results of six walls included in this project. The focus of this paper will be on presenting a brief summary of the project objective, testing protocol, and the theoretical approach to determine the WER number for the six walls.


    Paper ID: JAI102043

    DOI: 10.1520/JAI102043

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    Author
    Title Assessment of Energy Rating of Polyurethane Spray Foam Walls: Procedure and Interim Results
    Symposium Second Symposium on Heat-Air-Moisture Transport: Measurements and Implications in Buildings, 2009-04-20
    Committee C16