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Water absorption in coated Norway spruce (Picea abies) cladding boards

Wasseraufnahme von beschichteten Fassadenelementen aus Fichtenholz

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Abstract

Coated and uncoated specimens of fast-grown and slow-grown Norway spruce (Picea abies (L.) Karst) were subjected to water exposure according to the European standard EN 927-5, but with prolonged exposure time. The modified EN 927-5 method can be used to evaluate the performance of wood types in combination with coatings regarding liquid water uptake. A significant effect of wood type was only found after four weeks of exposure or more, indicating that the flux of water through a coating is unaffected by differences in spruce wood properties during the exposure time specified in the standard. Regarding coated specimens slow-grown spruce absorbed more water, but the resulting moisture content gain was higher in fast-grown spruce. The performances of the coatings relative to each other were similar within each wood type. With respect to uncoated reference specimens, fast-grown spruce absorbed the largest amounts of water. The same was found for moisture content gain.

Zusammenfassung

Beschichtete und unbeschichtete Prüfkörper aus schnell wachsendem und langsam wachsendem Fichtenholz (Picea abies (L.) Karst) wurden gemäß EN 927-5 flüssigem Wasser ausgesetzt, allerdings über eine längere Zeitspanne als in der Norm angegeben ist.

Die so modifizierte Standardmethode kann zur Untersuchung des Wasseraufnahmeverhaltens von beschichteten Holzarten herangezogen werden. Ein signifikanter Einfluss der Wuchsgeschwindigkeit konnte erst nach einer Wasserlagerung von vier Wochen oder länger festgestellt werden. Dies zeigt, dass die Wasserdurchlässigkeit der Beschichtung während der in der Norm vorgegebenen Einwirkungsdauer durch unterschiedliche Holzeigenschaften nicht beeinflusst wird. Bei den beschichteten Prüfkörpern nahm das Holz langsam wachsender Fichte mehr Wasser auf, allerdings stieg die Holzfeuchte bei Holz der schnell wachsenden Fichte stärker an. Das Verhalten der einzelnen Beschichtungen war bei beiden Holztypen ähnlich. Bei den unbeschichteten Kontrollproben waren die Wasseraufnahme und die Zunahme der Holzfeuchte bei den Proben aus schnell wachsender Fichte größer als bei denen aus langsam wachsender Fichte.

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Acknowledgements

Sigrun Kolstad (The Norwegian Forest and Landscape Institute) and Bjørn Slette (Norwegian University of Life Sciences) are gratefully acknowledged for participating in the weighing of the specimens. Knut Magnar Sandland (Treteknisk) is greatly acknowledged for reading and commenting on a preliminary version of the manuscript. Funding from The Research Council of Norway is greatly acknowledged as well.

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Authors and Affiliations

  1. Norwegian University of Life Sciences, P.O. Box 5003, 1432, Ås, Norway

    Mari Sand Sivertsen

  2. Norsk Treteknisk Institutt, P.O. Box 113, Blindern, 0314, Oslo, Norway

    Per Otto Flæte

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  1. Mari Sand Sivertsen
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  2. Per Otto Flæte
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Correspondence to Mari Sand Sivertsen.

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Sivertsen, M.S., Flæte, P.O. Water absorption in coated Norway spruce (Picea abies) cladding boards. Eur. J. Wood Prod. 70, 307–317 (2012). https://doi.org/10.1007/s00107-011-0557-8

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