Wood treated with water-borne preservatives, mainly CCA (copper, chromium and arsenic) and CCB (copper, chromium and boron) is often said to absorb more water than untreated wood. In laboratory tests this statement has not been confirmed (Johansson 1977). In 1986 a project was started to compare water absorption during outdoor exposure between wood stakes of pine, Pinus sylvestris L, and spruce, Picea abies, both untreated and treated with different preservatives. For comparison untreated stakes of different species were included as well as painted pine stakes. Results after 28 months' exposure were reported in IRG/WP/3533, 1989. In this document results after five years are reported.

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