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GreenBox, an Innovative Mass Timber Floor System | Mass Timber Podcast
June 15, 2026
This post is part of Thornton Tomasetti Here’s How: Mainstreaming Mass Timber, a podcast hosted by Paul Becker and Kristina Rogers exploring mass timber design, delivery and performance in structural engineering projects.
About This Episode
What if a mass timber floor system could improve structural efficiency, sustainability, acoustics and vibration performance, and constructability at the same time? In this episode, Senior Principal Paul Becker and Vice President Kristina Rogers speak with Associate Harry Crofton about GreenBox®, a prefabricated timber cassette system he developed through Thornton Tomasetti’s CORE studio and R&D work.
Listen to the Episode
Inside the Episode: GreenBox, an Innovative Mass Timber Floor System
This episode introduces GreenBox®, a prefabricated mass timber cassette system that reimagines how timber floors are manufactured, installed, maintained, and reused. Paul Becker and Kristina Rogers hear from Harry Crofton, who explains how cassette construction shifts work from the jobsite to the factory, where components can be built with tighter tolerances, greater quality control, and without exposure to weather or site constraints. The result is a system that can cover longer spans and be lifted into place quickly to speed construction.
The discussion compares GreenBox with conventional CLT floor systems, focusing on how its plywood skins, glulam joists and specialized fill work together to optimize structural capacity, services integration and coordination, acoustics, and vibration control. Also discussed are the system’s fire performance and superior moisture-management detailing. Rather than solving each performance issue with added layers, GreenBox integrates multiple functions into one lighter, more efficient assembly.
The episode also covers the benefits of GreenBox over the full life of a building and beyond: simple to repair, replace, and modify, it can also be easily disassembled and reused in circular construction.
