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    • Moisture Risk in Unvented Attics Due to Air Leakage Paths - Minneapolis Minnesota

    Metadata Updated: November 2, 2023

    IBACOS completed an initial analysis of moisture damage potential in an unvented attic insulated with closed-cell spray polyurethane foam. To complete this analysis, the research team collected field data, used computational fluid dynamics to quantify the airflow rates through individual airflow (crack) paths, simulated hourly flow rates through the leakage paths with CONTAM software, correlated the CONTAM flow rates with indoor humidity ratios from Building Energy Optimization software, and used "Warme und Feuchte instationar Pro two-dimensional modeling" to determine the moisture content of the building materials surrounding the cracks. Given the number of simplifying assumptions and numerical models associated with this analysis, the results indicate that localized damage due to high moisture content of the roof sheathing is possible under very low airflow rates. Reducing the number of assumptions and approximations through field studies and laboratory experiments would be valuable to understand the real-world moisture damage potential in unvented attics.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: Creative Commons Attribution

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    Dates

    Metadata Created Date October 31, 2023
    Metadata Updated Date November 2, 2023

    Metadata Source

    Harvested from OpenEI data.json

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date October 31, 2023
    Metadata Updated Date November 2, 2023
    Publisher Ibacos Innovation
    Maintainer
    Doi 10.25984/2204228
    Identifier https://data.openei.org/submissions/5495
    Data First Published 2016-04-27T06:00:00Z
    Data Last Modified 2023-11-01T16:40:27Z
    Public Access Level public
    Bureau Code 019:20
    Metadata Context https://openei.org/data.json
    Metadata Catalog ID https://openei.org/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Data Quality True
    Harvest Object Id 4d5d66d1-c0fe-4d04-8b18-e1e931c378ed
    Harvest Source Id 7cbf9085-0290-4e9f-bec1-91653baeddfd
    Harvest Source Title OpenEI data.json
    Homepage URL https://data.openei.org/submissions/5495
    License https://creativecommons.org/licenses/by/4.0/
    Old Spatial {"type":"Polygon","coordinates":-93.265,44.9778,-93.265,44.9778,-93.265,44.9778,-93.265,44.9778,-93.265,44.9778}
    Program Code 019:002
    Projectnumber FY14 AOP 1.9.1.19
    Projecttitle Building America
    Source Datajson Identifier True
    Source Hash c9a5579d6d2fdfbedb4ced0f39cf91dc4686ab6d59e0a4927cf11910b2211041
    Source Schema Version 1.1
    Spatial {"type":"Polygon","coordinates":-93.265,44.9778,-93.265,44.9778,-93.265,44.9778,-93.265,44.9778,-93.265,44.9778}

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