Specialty Timbers New Zealand

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Cypress

• The decay resistance of alternative species in an accelerated framing test - Assessment of decay after two years' exposure
  Specialty Timbers NZ report n/a
  June 2024
  These assessment results have been made available to industry by Scion, but funding was not available for Scion to produce a report. Sets of framing samples were exposed in high…
  

• Recalculation of Ovensii Bending Strength and Stiffness
  SWP-T154
  July 2023
  In terms of bending stiffness, the C. ovensii achieved the SG6 structural grade, in terms of bending strength, the C. ovensii achieved the SG12 structural grade resulting in an overall grade of SG6. To…
  

• The decay resistance of some wood species used as framing - Final report on the condition of samples
  SWP-T096
  July 2023
  Sets of framing samples were exposed in high humidity conditions of 85-90% relative humidity and 25 – 27°C. The species included in this test were: Untreated Cupressus lusitanica. Untreated Douglas fir. Untreated Eucalyptus nitens (installation…
  

• The condition of Cypress with or without thermal modification L-joints after one year’s field exposure
  SWP-T173
  June 2023
  After one year’s exposure, there was no decay on any of the untreated Cupressus lusitanica L-joint samples. No decay was observed on any of the thermally modified Cupressus lusitanica, L-joint samples No decay was…
  

• The condition of thermally modified cypress and Douglas fir decking after one year’s field exposure
  SWP-T172
  June 2023
  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…
  

• The condition of thermally modified cypress and Douglas fir flat panels after one year’s field exposure
  SWP-T171
  June 2023
  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 rate of Cypress stakes after two year’s exposure at the Whakarewarewa test site
  SWP-T167
  June 2023
  Stakes of Cupressus x ovensii grown in Rotoehu and Riverhead, and Cupressus x leylandii (Leyland cypress) were installed in the Whakarewarewa outdoor test area in April 2021. Untreated radiata pine and CCA H4 treated…
  

• The decay resistance of alternative species in an accelerated framing test Assessment of decay after one year’s exposure
  SWP-T160
  March 2023
  Sets of framing samples were exposed in high humidity conditions of 85-90% relative humidity and 25 – 27°C. The species and preservative treatments included in this test were: Eucalyptus fastigata, mixed heartwood\sapwood,…
  

• Decay rate of Cypress stakes after one year’s exposure at the Whakarewarewa test site
  SWP-T147
  July 2022
  Stakes of Cupressus x ovensii grown in Rotoehu and Riverhead, and Cupressus x leylandii (Leyland cypress) were installed in the Whakarewarewa outdoor test area in April 2021. Untreated radiata pine and CCA H4 treated…
  

• Interim fungus cellar results, thermally modified Douglas fir and Cupressus lusitanica
  SWP-FN
  June 2022
  Durability screening using the AWPC accelerated field simulator (AFS) test (Australasian Wood Preservation Committee, 2015) has been underway for 4 years. The species tested are as follows: Douglas-fir (SWP funded)…
  

• Techno-economic analysis of producing engineered and thermally modified products from specialty wood species
  SWP-T141
  January 2022
  This report covers an analysis of making a range of engineered and modified wood products from non-radiata species. The products and wood species considered were: Non-durable eucalypt peeled veneer Non-durable…
  

• New Zealand Cypress Strategy 2021 – 2041
  SWP-T138
  December 2021
  This strategy presents the business case for developing a cypress forest industry, in particular the required market development for cypress timber and growing a plantation industry that is of a…
  

• Cupressus x ovensii Bending Strength and Stiffness
  SWP-T129-
  July 2021
  In terms of bending stiffness, the C. ovensii achieved the SG6 structural grade, in terms of bending strength, the C. ovensii achieved the SG10 structural grade resulting in an overall grade of SG6. To…
  

• Grade recoveries from sawing 22-year-old unpruned cypress clones
  SWP-T116
  February 2021
  A Scion clonal cypress trial established in 1997 provided the opportunity to determine the grade recoveries of sawn timber from two cypress clones; GH5 (Cupressus lusitanica) and Ovensii (Cupressus lusitanica…
  

• Economic modelling of a C. ovensii clonal regimes for a range of growth rates
  SWP-T115
  December 2020
  The outcome from this analysis of a short rotation (20 year) no prune and no thin C. x ovensii regime using the FGR Cypress Calculator appears to be profitable based…
  

• A Strategy for the NZ Cypress Industry: Workshop report and draft action plan
  SWP-T112
  November 2020
  This document follows from Discussion Document produced by the Cypress Strategy Working Group in August 2020. Twenty participants from across the cypress value chain took part in a workshop in…
  

• NZ Cypress Forestry Strategy - Stage One 2019-2020
  SWP-T099
  November 2020
  Interim report – industry consultation; forest resource analysis; draft strategy development Outcomes of consultation with corporate growers and the harvesting and marketing and consultancy sectors
  

• Dimensional Stability of Specialty Species (final report)
  SWP-T090
  December 2019
  Changes in the moisture content of wood changes its dimensions. The magnitude of these changes (dimensional stability) can have a large impact on how the wood performs in service. Poor…
  

• Non-destructive detection of the heartwood-sapwood barrier
  SWP-T088
  September 2019
  This study examined the feasibility of using synthetic aperture radar (SAR) imaging to identify the heartwood-sapwood barrier in trees (Eucalyptus globoidea, Eucalyptus bosistoana and Cupressus ovensii). The dielectric properties measured of…
  

• Thermal Modification of Specialty Species Results of Scion’s SSIF-funded experiments
  SWP-T086
  September 2019
  The problem The objective of this work is to improve the properties of two specialty wood species (Eucalyptus nitens and Cupressus lusitanica) through thermal modification. Thermal modification darkens the colour…
  

• Dimensional Stability of Specialty Species (interim report)
  SWP-T074
  May 2019
  Dimensional changes caused by changes in wood moisture content (dimensional stability) can have a large impact on how the wood performs in service. Poor dimensional stability can lead to cracking,…
  

• Identifying processing opportunities for key specialty tree species; - processing options analysis using the WoodScape model
  SWP-T073
  May 2019
  The Specialty Wood Products Research Partnership wish to know where there are opportunities to develop processing of Douglas-fir, Cypress and Eucalyptus species (nitens and fastigata). A previous report covers the…
  

• Identifying processing opportunities for key specialty tree species – resource analysis
  SWP-T068
  May 2019
  This report covers the current and projected supply of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), Cypresses and Eucalyptus nitens (Deane & Maiden) Maiden across all the major wood supply regions of…
  

• The decay resistance of some wood species used as framing - Progress report on the condition of samples
  SWP-T064
  September 2018
  Sets of framing samples were exposed in high humidity conditions of 85-90% relative humidity and 25 – 27°C. The species included in this test were: untreated Cupressus lusitanica untreated Douglas-fir…
  

• Thermal Modification of Specialty Species: Results of Scion’s Core Funded Experiments
  SWP-T063
  August 2018
  The objective of this work is to improve the properties of two specialty wood species (Eucalyptus nitens and Cupressus lusitanica) through thermal modification. Key results The major findings of this study…
  

• LVL Stiffness Calculator User Guide
  SWP-T059
  June 2018
  This software is only intended to be used as a decision tool that enables questions to be asked about the potential suitability of a wood resource being able to supply a range of LVL grades.…
  

• Examples of cypress sapwood resisting attack by the common household borer (Anobium punctatum) in New Zealand
  EXAMPLES_OF_CYPRESS_SAPWOOD-reduced_size
  February 2017
  This report documents examples showing cypress sapwood timber to have resistance to household borer, both in internal applications and those protected from weather but exposed to exterior or ground atmosphere.…
  

• Durability testing of locally grown cypress species
  DSTN-023
  March 2011
  This Tech Note summarises all durability testing conducted by Scion over the last fifty years for wood obtained from cypress species. These tests include stake tests and post tests in…
  

• Summary of Tests on Untreated Douglas-fir, Treated and Untreated Radiata pine for Use as Framing in Domestic Construction in New Zealand
  FFR-DS029
  February 2011
  The aftermath of the “Leaky Building Crisis” of the late 1990s to early 2000s led to a raft of changes in building standards, with particular reference to preservative treatment requirements…
  

• A Heartwood Durability Study on Leyland Cypresses
  FFR-_DS012
  June 2009
  Leyland cypresses are hybrids between Cupressus macrocarpa and Chamaecyparis nootkatensis. They have been propagated vegetatively for at least 100 years and offer the opportunity to look at heartwood durability on…
  

• Determinations issued, Codewords, February 08, issue 025
  Codewords_25_Feb08
  February 2008
  The six determinations have established certain criteria to decide whether macrocarpa, or Lawson or Mexican cypress timbers, are Code-compliant when installed to the exterior of buildings. Such timbers are the equivalent to structural-grade radiata pine treated to…
  

• The Decay resistance of Douglas fir, Macrocarpa, Lawson Cypress and European Larch Framing - Summary of Results after 52 weeks Exposure
  Mick_Hedley_BRANZ_52_week_mould_decay_trial
  November 2005
  Short pieces of 90 x 45mm framing timber of Douglas fir (Pseudotsuga menziesii), European larch (Larix decidua), Lawson cypress (Chamaecyparis lawsoniana), macrocarpa (Cupressus macrocarpa) and radiata pine (Pinus radiata) were…