Decay resistance of thermally modified Scots pine after 6 years' exposure above ground

Hannu Viitanen, Sini Metsä-Kortelainen, Antti Nurmi, Saila Jämsä

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific


    In the present study the performance of boards treated by ThermoWoodr process were studied above ground and the results given are based on a "modified" horizontal double- layer test. The base layer of boards was in direct contact with ground and the conditions were much harder than in the standard method. After six years' exposure clear differences were found between untreated Scots pine and treated ones. In all cases thermal modification improved the performance. The greatest differences were discovered in boards located in base and lower boards of the double layer test. The best performed thermally modified pine heartwood, where only very little decay was found in base layer boards laying against the ground. Other layers were not attacked. The same trend was detected with Scots pine sapwood, but already some decay was also present in lower and top layer of boards. The smallest differences between modified and unmodified were found in upper layer of boards, which mainly suffered from blue stain and cracking. Also in this occasion pine heartwood performed better than sapwood boards. In addition, measured moisture content figures were in good correlation with found decay rates.
    Original languageEnglish
    Title of host publicationProceedings IRG Annual Meeting 2013
    Publication statusPublished - 2013
    MoE publication typeB3 Non-refereed article in conference proceedings
    Event44th IRG Annual Meeting 2013, IRG44 - Stockholm, Sweden
    Duration: 16 Jun 201320 Jun 2013

    Publication series

    SeriesIRG Annual Meeting Proceedings


    Conference44th IRG Annual Meeting 2013, IRG44
    OtherAnnual Meeting of the International Research Group on Wood Protection


    • decay resistance
    • Scots pine
    • sapwood
    • heartwood
    • thermal modification


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