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Webinar – Part 1: Cantilever Diaphragms: Code Requirements and Relative Stiffness Issues

February 4, 2020 – 12:00 pm - 1:00 pm




This month we’re offering a special 4-part webinar series on the analysis of open-front or corridor-only shear wall diaphragms—delivered by one of the foremost experts in the field, Terry Malone, who literally wrote the book on irregular diaphragms. An understanding of this topic is essential for modern building designs that often include more glass, larger openings, and greater height than buildings in the past.

Join us Tuesdays and Thursdays from Feb 4 to Feb 13:
10 am Pacific, 11 am Mountain, 12 pm Central, 1 pm Eastern

Part 1 / Feb 4 – The series kicks off with a look at code requirements and relative stiffness issues associated with cantilever diaphragms in wood structures. Traditionally, wood-frame diaphragms are designed as flexible, meaning that shear forces are transferred to vertical-resisting systems based on tributary widths. However, cantilever diaphragms are required to be analyzed as semi-rigid or rigid, where distribution of shear forces is a function of relative stiffness of the supporting walls rather than tributary widths. This webinar will introduce unique conditions often found in structures that utilize cantilever diaphragms, including increased building heights, multi-story shear wall effects, and torsional irregularities. Current and future code provisions relative to cantilever wood diaphragms will also be discussed.

Part 1 sets the stage for the rest of the series:

  • Part 2 / Feb 6 – Shear Wall Design in Cantilever Diaphragm Structures – Details / Register
  • Part 3 / Feb 11 – Cantilever Diaphragm Design, Flexibility Check, and Drift Calculations – Details / Register
  • Part 4 / Feb 13 – Torsional Irregularity and Design Example Checks of an Open Front Building – Details / Register


Terry Malone, PE, SE, WoodWorks

Terry is a licensed structural engineer in Washington, Oregon and Arizona. Prior to joining WoodWorks, he was a principal in consulting structural engineering firms in Washington and Oregon, conducted third-party structural plan reviews and has served as a faculty member at St. Martin’s College in Lacey, Washington. Terry has over 35 years of wood design experience and has taken an active role as a presenter providing seminars at state and local ICC chapters and professional engineering organizations. Terry is author of The Analysis of Irregular Shaped Structures: Diaphragms and Shear Walls, published by McGraw-Hill and ICC. He is a member of the Structural Engineers’ Association of Arizona and the International Code Council.

Click on the presentation name to download the presentation

Part 1: Cantilever Diaphragms: Code Requirements and Relative Stiffness Issues

If you missed any of these webinars you can access the recorded video (for viewing only, no credit) here.

Attendees will qualify for 1 AIA/CES HSW LU, 1 PDH credit or 0.1 ICC credit (FBPE board-approved).

Certificates will be emailed to participants.


If you are attending the webcast as a group, each person in your group requiring a certificate of attendance must sign the Group Sign-in form.

  • Download and print ONE sign-in sheet for your group.
  • Return the completed sign-in form by email within 48 hours to .
  • WoodWorks will send each attendee a certificate of completion within 2 weeks.

With GoToWebcast there is no software to download. You join and listen as you would a YouTube video – it is a live feed and you can use your computer speakers or a headset to listen.

To register in advance click on the Register button, answer a few questions and once finished exit out of the browser. You will receive a confirmation email with the link again provided to join at the time of the Webinar. To join the live event click on the link, under ‘Already Registered’ enter your email address and login.

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Need more information on joining our Webinars? Check out the GoToWebcast Information tab for how to register, requirements and more.

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February 4
12:00 pm - 1:00 pm
Event Category:

WoodWorks offers a wide range of in-person and online training opportunities, from Wood Design Symposiums that include concurrent seminars and a trade show, to half-day workshops, lunchtime seminars and webinars.