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Moisture Risk Analysis for Three Construction Variants of a Wooden Inverted Flat Roof

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  • Agnieszka Sadłowska-Sałęga

    (Faculty of Environmental Engineering and Land Surveying, University of Agriculture in Krakow, 31-120 Kraków, Poland)

  • Krzysztof Wąs

    (Faculty of Environmental Engineering and Land Surveying, University of Agriculture in Krakow, 31-120 Kraków, Poland)

Abstract

The paper presents an analysis of the hygrothermal performance of an inverted flat roof with a CLT (cross-laminated timber) structure in a building that meets the requirements of Passive House Standard (PHS) with regards to the potential risk of moisture. The calculations were made in the WUFI ® Plus and WUFI ® Bio software. The following variants were taken into account: three structure configurations, three different external climates and different scenarios of microclimate control and air change rate. The results of the calculations show that, especially in cooler climates, there is an actual moisture risk in the structure despite the excellent thermal insulation. The structure of the inverted flat roof, due to the use of a tight membrane on the outer side, allows for the partition to discharge the excess moisture only to the inside of the building. Ensuring the comfort of users may require periodic humidification of internal air, which translates directly into an increase in moisture content of the structure. The performed analysis clearly showed that there are no universal solutions. It is important to point out that for the proper performance of inverted wooden roofs, it is crucial to analyse moisture, not only thermal and energy parameters.

Suggested Citation

  • Agnieszka Sadłowska-Sałęga & Krzysztof Wąs, 2021. "Moisture Risk Analysis for Three Construction Variants of a Wooden Inverted Flat Roof," Energies, MDPI, vol. 14(23), pages 1-20, November.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:23:p:7898-:d:687317
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    References listed on IDEAS

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    1. Manso, Maria & Teotónio, Inês & Silva, Cristina Matos & Cruz, Carlos Oliveira, 2021. "Green roof and green wall benefits and costs: A review of the quantitative evidence," Renewable and Sustainable Energy Reviews, Elsevier, vol. 135(C).
    2. Bevilacqua, Piero & Bruno, Roberto & Arcuri, Natale, 2020. "Green roofs in a Mediterranean climate: energy performances based on in-situ experimental data," Renewable Energy, Elsevier, vol. 152(C), pages 1414-1430.
    3. Alejandro Padilla-Rivera & Ben Amor & Pierre Blanchet, 2018. "Evaluating the Link between Low Carbon Reductions Strategies and Its Performance in the Context of Climate Change: A Carbon Footprint of a Wood-Frame Residential Building in Quebec, Canada," Sustainability, MDPI, vol. 10(8), pages 1-20, August.
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    Cited by:

    1. Anna Szymczak-Graczyk & Gabriela Gajewska & Ireneusz Laks & Wojciech Kostrzewski, 2022. "Influence of Variable Moisture Conditions on the Value of the Thermal Conductivity of Selected Insulation Materials Used in Passive Buildings," Energies, MDPI, vol. 15(7), pages 1-17, April.
    2. Paweł Sokołowski & Grzegorz Nawalany & Małgorzata Michalik, 2022. "Analysis of the Impact of Flooring Material and Construction Solutions on Heat Exchange with the Ground in a Historic Wooden Building," Energies, MDPI, vol. 15(16), pages 1-17, August.

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