Loading Events

Mass Timber: Mass Changes In Mass Timber

Mass Timber is coming and this presentation will review the highly anticipated building code changes set to transform the building industry allowing timber construction for up to 18 stories. This panel wants you to walk away with an understanding of the concepts behind the new Type IV code sections – what is possible now and what is coming in the future. Through discourse with the panelists and attendees, we will review the general application of the code changes, structural system implications, fire & life safety – shifting the paradigm of non-combustible high-rise to embody mass timber, acoustic performance and assemblies, and summarizing the provisions of the new code through a case study.

Joe Mayo AIA
Joe Mayo is an architect in Seattle at Mahlum and author Solid Wood: Mass Timber Architecture, Technology and Design, the first book devoted solely to mass timber commercial buildings. He recently completed three CLT classroom buildings in Washington State, and is currently designing modular CLT townhomes for a site in Seattle and a prototype mass timber classroom building. Joe has been an active advocate of mass timber for nearly a decade. He worked with the City of Seattle Department of Planning and Development to create a city-wide CLT taskforce. He has recently worked with AIA WA Council and non-profit Forterra and together were successful in changing the Washington State Building Code to allow greater use of mass timber. The code changes go into effect this summer.

Kirsten Clemens AIA
Weber Thompson
Senior Associate Kirsten Clemens is a strong designer with the ability to create a visual story to explain her designs to a wide variety of populations. She applies those skills to her mixed-use projects, ranging from seven to forty stories. She is a core member of the firm’s sustainability task force, and was the lead designer of Solis, one of Seattle’s largest multifamily Passive House structures to date, currently under construction. In addition, this year she will take a closer look at the feasibility of combining CLT, modular construction, and hospitality as part of an internal research and innovation effort at the firm. Outside the office, Kirsten just wrapped up a 10-year term on the Seattle Architecture Foundation Board of Directors, which will allow her more free time to participate in design dialogue through the world of academia and participate in broader community research efforts surrounding mass timber.

Chris Duvall
Coughlin Porter Lundeen
Chris Duvall is a licensed structural engineer and Principal at Coughlin Porter Lundeen.  He is intrigued by structures of all types and particularly drawn to complex geometries that require a high level of detail. His work is divided between public and private projects that utilize all building materials, both traditional and those on the cutting-edge of development – especially Mass Timber. Over the past 7 years, Chris has extensively researched and presented mass timber structural systems locally and nationally, and helped lead CPL’s internal Mass Timber Task Group.  He has designed multifamily and commercial office projects utilizing CLT and is currently working on multiple mass timber designs including Timber-Concrete floor systems.  He serves AIA Seattle as a co-chair for the Mass Timber Committee.

Jon Siu
City of Seattle Department of Construction & Inspections
Jon Siu serves as the Principal Engineer and Building Official for the City of Seattle’s Department of Construction and Inspections (SDCI), a position he has held for the last 19 of the 35 years he has been with the City.  In that capacity, Jon serves as the top technical expert in the department for the construction codes administered by SDCI.

Jon serves on many national committees involved in building code and standards development, including the ICC Ad Hoc Committee on Tall Wood Buildings, the (2021) IBC Structural Committee, and the ASCE 7-22 Main Committee.  He served as a Director for the Seattle Chapter of the Structural Engineers Association of Washington (SEAW), and is a Past President of the Washington Association of Building Officials (WABO).  In his spare time, Jon also serves as the director of SDCI’s emergency response program.

Jon is a licensed civil and structural engineer in the State of Washington, and received his Bachelor and Master of Science degrees in Civil Engineering Structures from UCLA.

Registration is free of charge, but strongly encouraged as space is limited.

Click here to register

Learn more about the Mass Timber committee’s work here. Contact Connor Descheemaker with program questions or concerns.


July 10, 2019
5:30 pm - 7:00 pm
Event Price


AIA Seattle
(206) 448-4938


WA United States
+ Google Map