Protection of wood by design
Hansen, M.H. and A. Nicolajsen
1999
8th International Conference on Durability of Building Materials and Components, Vancouver, Canada, May 28 - June 3, pp. 723-733
Durability, pressure impregnated wood, wall cladding, protection by design, climate simulator, drip caps
Hansen, M.H. and A. Nicolajsen, (1999), "Protection of wood by design", 8th International Conference on Durability of Building Materials and Components, Vancouver, Canada, May 28 - June 3, pp. 723-733.
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Environmental concerns call for limited use of chemically treated wood for exterior wall cladding. Instead, durability should be guaranteed by using protection by design or by using wood of improved quality. SBI participated in a Nordic project concerning wood protection by design and carried out a number of tests in the laboratory. The durability of timber claddings was evaluated by testing wood samples exposed to artificial ageing from cyclic influences from sun, rain, frost and thaw in The Four Seasons, a climate simulator. Six different tree species as well as various surface treatments and orientations etc. were tested. The two species that did best were larch and thuja. In The Driving Rain Chamber the protecting effect of different types of painted drip caps was tested. The protection right under the drip cap increases with the depth of the drip cap. Drip caps with inclinations of 1:5 and 1:4 provided the best protection and a notch on the underside of the drip cap increased the protection. |
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