Use of Rigid Phenolic Foam Exterior Insulation for Renovation of Concrete Sandwich Walls

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    Improving energy efficiency of the building envelope in renovations requires new technologies and materials. Additional exterior insulation system can improve the energy efficiency and indoor thermal comfort. Safe moisture performance of the additional exterior insulation assembly requires suitable properties for the materials. Rigid phenolic foam insulation is a new product that offers several advantages. The thermal conductivity of the material can be 0.020 W/mK (0.0116 BTUIT hr-1 ft-1 oF-1), allowing good thermal resistance with significantly thin layers. Rigid phenolic foam has relatively low water vapor diffusion resistance at high humidity levels where drying efficiency is needed. This paper presents a numerical study about the moisture performance of an exterior renovation systems applied on concrete sandwich walls under cold climates. The renovation structure has exterior sheathing, ventilated cavity and additional thermal insulation. The main moisture loads were caused by the wet exterior layers of the old wall exposed to driving rain before renovation. The study compares the drying efficiency and humidity conditions of the renovation application using rigid phenolic foam or mineral wool insulation. All the renovation cases improved the moisture safety of the structure from the original, and the risk for mould growth remained low for both the insulation materials. The results show that the studied renovation system can be safely applied using rigid phenolic foam insulation.
    Original languageEnglish
    Title of host publicationProceedings of the Thermal Performance of the Exterior Envelopes of Whole Buildings XIV
    PublisherASHRAE
    Number of pages8
    ISBN (Electronic)978-1-947192-44-7
    Publication statusPublished - 2019
    MoE publication typeA4 Article in a conference publication
    EventInternational Conference on Thermal Performance of the Exterior Envelopes of Whole Buildings XIV : 2019 Buildings XIV International Conference - Clearwater Beach, FL, USA, Clearwater, United States
    Duration: 9 Dec 201912 Dec 2019

    Conference

    ConferenceInternational Conference on Thermal Performance of the Exterior Envelopes of Whole Buildings XIV
    Abbreviated titleBuildings XIV
    Country/TerritoryUnited States
    CityClearwater
    Period9/12/1912/12/19

    Keywords

    • renovation
    • rigid phenolic foam
    • thermal insulation
    • moisture
    • mold growth
    • drying
    • safety

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