When Wood Cladding Degenerates

Lessons on durability from traditional wood claddings after long weathering in real conditions

Authors

DOI:

https://doi.org/10.7577/formakademisk.5401

Keywords:

wood cladding, durability, traditions, decay, performance

Abstract

For several decades, the mechanisms of deterioration of wood exposed outdoors have been scrutinized to ameliorate the performance of this versatile material when used for purposes such as house cladding. The performance of cladding seems to depend highly on the durability of wood, in turn connected to water uptake, which can vary greatly. How long a cladding can function is particularly complicated to define because of its paradoxical role as a sacrificial and aesthetic layer. However, thanks to reparations and maintenance, many traditional claddings are still preserved. They have been produced and main­tained with local resources and show that low-processed wood can be durable in outdoor conditions. The contrast with modern approaches, such as wood modification or importation of durable species, raises the question: what durability of wood is concretely required for cladding purposes? The exhibition shows characteristics of wood weathered for up to hundreds of years, facilitating an under­standing of the impact damage can have on the performance of cladding. The samples, issued from traditional French and Scandinavian facades, illustrate how exposure level influences degradation, confirming the role of rot and revealing the ones of erosion and abrasion in the degeneration of wood cladding. Both Alder and Pine seem to have the potential to perform naturally well as cladding for longer than it takes for the trees to regenerate. Traditions might teach us how to use local wood in a durable way if we consider biodegradation as an opportunity to build without creating waste, rather than as a threat.

Author Biography

Géraldine Brun, University of Gothenburg

PhD student
Department of Conservation

References

Almevik, G. (2012). Byggnaden som kunskapskälla [The building as a source of knowledge] (Publication No. 27). [Doctoral dissertation, University of Gothenburg]. Acta Universitatis Gothonburgensis. https://gupea.ub.gu.se/handle/2077/28072

Byggforskserien (2022). Byggdetaljer 542.101: Stående kledning [Building details 542.101: vertical cladding]. Norges byggforskningsinstitutt.

Feist, W. C. (1990). Outdoor wood weathering and protection. Archaeological wood, properties, chemistry, and preservation. In R. M. Rowell & R. J. Barbour. Archaeological Wood (Advanced in Chemistry Series, 225, pp. 263-298). http://dx.doi.org/10.1021/ba-1990-0225.ch011 https://doi.org/10.1021/ba-1990-0225.ch011

Frøstrup, A. (2016). Tømrerteori [Corner timber theory]. Universitetsforlaget.

Gobakken, L. R., Mattson, J., & Alfredsen, G. (2008). In-service performance of wood depends upon the critical in-situ conditions. Case studies. IRG/WP: 08-20382.

Godal, J. B. (2012). Tekking og kleding med emne frå skog og mark: frå den eldre materialforståinga [Roofing and cladding with objects from forest and land: from the old material comprehension]. Akademika forlag.

Hill, C., Kymäläinen, M., & Rautkari, L. (2022). Review of the use of solid wood as an external cladding material in the built environment. Journal of Materials Science, 57(20), 9031-9076. https://doi.org/10.1007/s10853-022-07211-x https://doi.org/10.1007/s10853-022-07211-x

Kutnik, M., Suttie, E. & Brischke, C. (2014). European standards on durability and performance of wood and wood-based products–Trends and challenges. Wood Material Science & Engineering, 9(3), 122-133. https://doi.org/10.1080/17480272.2014.894574 https://doi.org/10.1080/17480272.2014.894574

Plesser, T. S., Kristjansdottir, T., Tellnes, L., Flæte, P. O., Gobakken, L. R., & Alfredsen, G. (2013). Miljøanalyse av trefasader [Environmental analyse of wooden facades]. SINTEF Akademisk forlag.

Rentzhog, S. (1986). Stad i trä - panelarkitekturen: ett skede i den svenska småstadens byggnadshistoria [Town in wood – panels’ architecture: a stage in the Swedish history of buildings in small towns]. Nordiska museets handlingar, 2. uppl. (Original work published 1937).

Sandberg, K., & Pousette, A. (2013). Träfasader: Guide för projektering, materialtillverkning, montage, underhåll. (Version 2) [Wooden facades: Guide for planning, making, assembling, maintaining. Version 2]. SP INFO 2013(32). https://ri.diva-portal.org/smash/record.jsf?pid=diva2:961499

Sell, J., & Feist, W. C. (1986). Role of density in the erosion of wood during weathering. Forest Products Journal, 36(3), 57-60.

Sivertsen, M. S. (2010). Liquid water absorption in wood cladding boards and log sections with and without surface treatment (Publication No. 2010:6). [Doctoral dissertation, Norwegian University of Life Sciences]. http://hdl.handle.net/11250/2429312

SS-EN 335. (2013). Durability of wood and wood-based products – Use classes: definitions, application to solid wood and wood-based products. iTeh. https://standards.iteh.ai/catalog/standards/cen/e5d368b1-2232-47e2-8349-ee85cb6c895b/en-335-2013

SS-EN 350. (2016). Durability of wood and wood-based products – Testing and classification of the durability to biological agents of wood and wood-based materials. iTeh. https://standards.iteh.ai/catalog/standards/cen/b02d18a7-87ce-4a20-84c7-c0de641a2780/en-350-2016

Svensson Meulmann, S., & Sjökvist, T. (2023). The potential of uncoated Norway spruce as a façade material—A review. Forests, 14(6), Article 1153. https://doi.org/10.3390/f14061153 https://doi.org/10.3390/f14061153

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Published

2023-09-21

How to Cite

Brun, G. (2023). When Wood Cladding Degenerates: Lessons on durability from traditional wood claddings after long weathering in real conditions. FormAkademisk, 16(4). https://doi.org/10.7577/formakademisk.5401

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