172 - Lessons from mass timber experiments with Danny Hopkin

One could argue full-scale experiments on fire phenomena are the most enriching for our knowledge as the fire community. The costs associated with them and logistical nightmares of organizing them make them an uncommon sight. However, in an instance where we reach the boundaries of our knowledge, they are necessary to progress further. That was the case of the research programme carried out by the OFR, in the umbrella of Structural Timber Association Special Interest Group (SIG) - CLT compartment fire behaviour, including the industrial partners: Binderholtz, KLH and Stora Enso, Henkel and Fermacell. Two large experimental packages of that collaboration ended up in my laboratory, and we got to test our hypothesis and progress our approach to designing mass timber through experiments.In this podcast episode, Dr Danny Hopkin makes a comeback to the show to give us insight into the observations and conclusions of those very large research programmes. We focus on how findings relate to the current design paradigm, and in which areas the approach has shifted. Following the evolution of the experiment itself, we discuss the changes in the fire behaviour as less and less surfaces were encapsulated, and some problems with partial protection that emerged as a consequence. Finally, we cover topics such as delamination, self-extinction and external flame from mass timber buildings – all important considerations for a designer.If you would like to learn more about the experiments we have done, please go to the research papers:Hopkin D., et al. Full-Scale Fire Experiments on Cross-Laminated Timber Residential Enclosures Featuring Different Lining Protection ConfigurationsHopkin D., et al. Large-Scale Enclosure Fire Experiments Adopting CLT Slabs with Different Types of Polyurethane Adhesives: Genesis and Preliminary FindingsHopkin D., et al. Implications Of A Down-stand Beam On The Ceiling Flame Extension Characteristics In A Large-scale Clt Enclosure Fire ExperimentOr the STA document library.----The Fire Science Show is produced by the Fire Science Media in collaboration with OFR Consultants. Thank you to the podcast sponsor for their continuous support towards our mission.