Engineered wood products
Please note: Some of these reports are restricted access.
- Experimental Studies on Single and Coupled Douglas-fir CLT Shear Walls with High-Capacity Connections
SWP-T169 - Access: unrestricted.
June 2023
As an engineered timber product, cross-laminated timber (CLT) is currently gaining popularity in New Zealand and globally. This two-year project aims to develop high-capacity Douglas-fir CLT shear wall structures that…
- Techno-economic analysis of producing engineered and thermally modified products from specialty wood species
SWP-T141 - Access: unrestricted.
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…
- Producing High-stiffness LVL from Eucalyptus fastigata: Part 3. LVL production and mechanical properties
SWP-T135 - Access: unrestricted.
November 2021
Laminated veneer lumber (LVL) has been produced in a commercial radiata pine mill (JNL Wairarapa) using veneers from 23-year-old Eucalyptus fastigata. The veneers were glued using one of the glue formulations…
- Experimental and Parametric Studies on Douglas-fir CLT Shear Walls with High Capacity Connections
SWP-T128 - Access: unrestricted.
July 2021
As an engineered timber product, cross-laminated timber (CLT) is currently gaining popularity around the world including New Zealand and Australia. Compared with Radiata pine, Douglas-fir is underutilised in the New…
- Peeling and sawing pruned E. fastigata for high-stiffness veneers: Part 2. Dry grade recovery and downstream testing
SWP-T109 - Access: unrestricted.
November 2020
The feasibility of producing high stiffness veneers from E. fastigata has been investigated. Previous work found that the net veneer recovery was good (60% of peelable volume) and the Metriguard stiffness measurements…
- Bonding of Eucalyptus fastigata veneer
SWP-T103 - Access: NZFFA membership. This SWP report shall at all times be kept confidential and not directly or indirectly be made available to anyone who is not an SWP member.
November 2020
Aim of this work: To determine if two standard Hexion commercial phenolic resins will bond the E. fastigata veneer. Previous Hexion NZ work has shown poor bonds with a number of different…
- Experimental testing of high capacity screwed and nailed connections in Douglas-fir CLT
SWP-T098- - Access: unrestricted.
April 2020
This report presents experimental results of two project tasks. The first task is to study withdrawal behaviour of self-tapping screws (STS) in Douglas-fir CLT by conducting 167 withdrawal tests. It…
- Assessing properties of E. nitens laminated flooring
SWP-T097 - Access: unrestricted.
April 2020
Worldwide there is increased interest in engineered flooring products, which combine the look of solid wood with increased dimensional stability (i.e. reduced movement in service) and reduced distortion. Specialty Timber…
- Peeling pruned E. fastigata for high-stiffness veneers: Part 1. Green grade recoveries
- Access: NZFFA membership. This SWP report shall at all times be kept confidential and not directly or indirectly be made available to anyone who is not an SWP member.
March 2020
New approaches are being sought to produce high stiffness veneers from New Zealand grown trees. Here the feasibility of producing high stiffness veneers from pruned Eucalyptus fastigata has been investigated. 42m3 of pruned…
- Assessing the Bending and Density Properties of six Eucalypt Species
SWP-T080 - Access: unrestricted.
June 2019
Small clear bending strength samples were cut from the following 16 year old trees that had already been felled for an earlier SWP durability study. E. bosistoana E. quadrangulata E.…
- Experimental studies on Douglas-fir CLT connections and core-walls
SWP-T082 - Access: unrestricted.
June 2019
This project report summarizes the experimental testing results of Douglas-fir Cross-laminated Timber (CLT) connections and core-walls. 54 screwed connection tests were performed under both monotonic and cyclic loading, and 31…
- Rotary peeling of 15 year old E. bosistoana and E. quadrangulata
SWP-T079 - Access: NZFFA membership. This SWP report shall at all times be kept confidential and not directly or indirectly be made available to anyone who is not an SWP member.
June 2019
It was demonstrated that rotary peeled veneers of good surface quality can be obtained from 15 year old Eucalyptus bosistoana and E. quadrangulata trees grown in New Zealand. The mechanical…
- LVL Stiffness Calculator User Guide
SWP-T059 - Access: unrestricted.
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.…
- Experimental studies on rolling Shear Strength properties of Douglas fir CLT and Monotonic Behaviour of Dowelled Connections
SWP-T053 - Access: unrestricted.
June 2018
Cross laminated timber (CLT) production and research in NZ is currently dominated by Radiata pine. However, there is a significant resource of Douglas-fir (D. fir) available in NZ, not widely processed on-shore.…
- Eucalyptus fastigata Veneer Stiffness
SWP-T048 - Access: unrestricted.
May 2018
UPT (ultrasonic propagation times) on its own is measuring both changes in density and changes in MoE, thus without an independent density measurement it is not possible to reliably determine…
- LVL Trial: Pre-Harvest Stand Assessment
SWP-T042 - Access: unrestricted.
February 2018
Two trials located in Marlborough have been assessed as a potential source of peeler logs to carry out a peeler study. The trials are: E. bosistoana trial planted in 2003…
- Identification of Issues and Opportunities for LVL from NZ Eucalypts
SWP-T015 - Access: unrestricted.
October 2016
Information on the opportunities and possible issues for LVL made from eucalypts available or likely to be available in NZ is reviewed and summarised. While it is generally agreed that…
- Eucalyptus nitens Optimised Engineered Lumber (OELTM) Trial
SWP-T014 - Access: unrestricted.
September 2016
The OELTM (Optimised Engineered Lumber) technology produces structural products with known, uniform and reliable properties. There is financial advantage derived from the fact that all the merchantable OELTM production output is certified…
- Douglas-Fir Optimised Engineered Lumber (OELTM) Trial
SWP-T007 - Access: unrestricted.
July 2016
The OELTM (Optimised Engineered Lumber) technology produces structural products with known, uniform and reliable properties. There is financial advantage derived from the fact that all the merchantable OELTM production output is certified…