Farm Forestry New ZealandThe condition of thermally modified cypress and Douglas fir flat panels after one year’s field exposure
By Ian Simpson and Tripti Singh, June 2023.
Download SWP-T171 (pdf)
Executive summary
After one year exposure at the Whakarewarewa test field site in Rotorua, there was no decay on any of the untreated Cupressus macrocarpa, Cupressus lusitanica, Cupressus x.ovensi and Douglas fir flat panel samples. No decay was observed on any of the thermally modified Cupressus lusitanica and Douglas fir flat panel samples. No decay was observed on any of the commercial benchmark samples (Accoya, Kebony, Vulcan or Linea fibre cement).
Well-established decay was observed on one of the untreated radiata pine samples. No decay was observed on the unstained sapwood radiata pine samples or on the H3.1 LOSP treated or H3 CCA treated radiata pine samples.
The unstained samples had turned a silver colour. The level of surface checking was generally minor.
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