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The condition of thermally modified cypress and Douglas fir decking after one year’s field exposure

By Ian Simpson and Tripti Singh, June 2023.

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Executive summary

After one year exposure, there was no decay on any of the untreated Cupressus macrocarpa, Cupressus lusitanica, Cupressus x.ovensi and Douglas fir decking samples. No decay was observed on any of the thermally modified Cupressus lusitanica and Douglas fir decking samples. No decay was observed on any of the commercial benchmark decking samples (Accoya and Kebony).

Minor decay was observed on six of the ten untreated unstained sapwood radiata pine samples. No decay was observed on the stained sapwood radiata pine samples or on the H3 CCA treated radiata pine samples.

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