TDS Webinar Series



Timber Design Society 2021 Series 1
Reinforcement of Timber Members | Presented by Daniel Moroder, 8th April 2021

Current advances in timber engineer are mostly due to the large availability of mass timber products and modern fastener systems. In addition to these, reinforcement of timber members around disturbed areas like notches, penetrations or complex member connections is allowing designers to push the limitations of timber.

These limitations, like low tensile and compression strength perpendicular to grain, can be overcome with the use of reinforcement like screws, rods or glued wooden panels. These measures can ensure an adequate and robust load path in complex timber designs, similar to rebars in concrete.

This webinar revisits basic timber properties to justify the need of reinforcement and provides an overview of typical design situations where additional design checks and potential reinforcement might be required. Different solutions will be discussed including their advantages and disadvantages. The presentation is based on the NZ Wood Guideline Chapter 12.6 ‘Reinforcement of Timber Members’ and will also include the derivations of some of the recommendations. Typical design situations with notches, joints loaded perpendicular to grain, penetrations, bearing reinforcement, shear reinforcement, moment resisting connections and joints with multiple fasteners will be discussed.


Timber Design Society 2021 Series 2
Fire Engineering for Timber Structures
| Presented by Dr Andy Buchanan, 6th May 2021

The topic of most interest to architects is the group number system for exposed wood surfaces, as influenced by the effect of automatic fire sprinkler systems.

The main part of the webinar will cover structural design for fire safety in timber buildings, with reference to the new standard AS/NZS 1720.4. This will include an introduction to fire resistance testing as the basis for structural fire design of light timber framing and mass timber structural members. The webinar will also include charring rates of protected and unprotected wood products, wood properties at elevated temperatures, and fire design of connections. The seminar will be based on the NZ Wood Design Guide for Fire Safety…


Timber Design Society 2021 Series 3
Timber Connections with Engineered Wood Screws |
Presented by Justin Brown, 3rd June 2021

This webinar provides an overview of engineered wood screws properties, applications in timber connections, and considerations for design.

Engineered wood screws have distinct differences to traditional wood screws and coach screws which are currently referenced in the NZS 3603 Timber Structures Standard. Their high yield strength, thread pitch and length (for some application over the full length), and large range of diameters, lengths, and head types provide many advantages. The webinar will present state-of-the-art design considerations for Engineered wood screws based on recent research.

You can view the PDF slides here


Timber Design Society 2021 Series 4
An introduction of mass timber post and beam construction |
Presented by Lisa Oliver, 1st July 2021

Post and beam construction refers to a system where a buildings’ vertical support is built of beams and columns. Compared to conventional light timber framing, timber post and beam construction replaces the need for load bearing walls, allowing for large open spaces. This webinar will highlight the benefits and flexibility of mass timber post and beam construction. You will be introduced to what is possible, some key design drivers and where to find more detailed design information.

Lisa Oliver is a Project Director with Holmes Consulting LP and vice president of the Timber Design Society. She is a Chartered Professional Engineer and has a master’s degree from the University of Canterbury. Lisa has a broad range of structural design and assessment experience in New Zealand and in the Netherlands. Lisa’s design experience with timber includes designing projects such as the MOTAT Aviation Display Hall. She recently co-authored the NZWood Design Guide, Post and Beam Timber Construction. Currently based in Christchurch, Lisa is involved in the sustainability and timber aspects across many projects.


Timber Design Society 2021 Series 5
A Kiwi in Canada: Mass timber case studies and timber design learnings
Presented by Andrew Dunbar, 12th August 2021

North America is quickly becoming an innovation hub for the implementation of mass timber structures. This is helped by an abundant source of an excellent natural resource (trees) and a supporting industry turning that resource into a material perfect for the building environment.

This presentation is based on experience while working in Canada at Fast + Epp, a firm recognised internationally for their work with mass timber. The presentation will cover general observations of the differences between the New Zealand and Canadian mass timber industries along with case studies of two mass timber buildings – the new 4-storey Fast + Epp office featuring “kiwi” seismic resilience technology, and a 10-storey structure with a full timber lateral system.

Andrew Dunbar is a senior structural engineer at Structex based predominantly in Christchurch. Andrew originally joined Structex as a graduate engineer following the completion of his master’s degree at the University of Canterbury with a focus on mutli-storey timber structures. Andrew is particularly passionate about timber structures, and in 2019, returned to Structex after a 2-year sabbatical in Vancouver, Canada, working at Fast + Epp – renowned for pushing the boundaries of mass timber. In Vancouver, he furthered his expertise in mass timber structures and was involved in several large projects and has returned to New Zealand to continue the push towards mass timber in the NZ context.