Understanding Fire Safety and the Use of Foam Sheathing
The Grenfell Tower tragedy was the worst building fire in London in recent memory. There have also been many concerns about fire safety and regulatory compliance at Grenfell Tower, including the lack of a working fire alarm system or sprinklers. With multiple fatalities and accusations of neglect, it is no surprise the accident investigation has turned into a full-blown criminal investigation. A key question being asked, even though U.S. codes were not involved, is: “Given all the concerns surrounding the Grenfell fire, does this event reflect code compliant performance in a way that should cause significant regulatory changes for construction in the U.S.?”
One concern involves the performance of foam plastic insulated sheathing (FPIS) with different types of cladding. It is worth taking a look at both the important use requirements for FPIS and the extent of cladding options that are code compliant. Strictly conforming to the International Building Code (IBC) can help keep builders and designers from both overreacting to a tragedy like the Grenfell Tower fire and from perpetuating unsafe practices.
Key code compliance considerations can be found here: Post Grenfell, Do You Know the Code and Your Cladding Options?
Additionally, the Foam Sheathing Committee (FSC) of the American Chemistry Council (ACC) has created the flyer below (click on the image to view a larger version) to summarize key concepts for builders, designers and building officials to consider.
Everyone involved in building construction is focused on providing as many safe and code compliant options to the market as possible. This generally results in the best engineered, economic and compliant solutions for any given project. If we allow emotion to drive decision making and take away generally accepted engineering practice, there may be significant unintended consequences. It’s important to remain focused on providing the most economical, safe and code-compliant solutions. Many companies have worked hard to create highly engineered, safe and innovative product offerings.
- London's Grenfell Fire: Will Plastics Be Inappropriately Blamed?
- ICC Provides Perspective on Combustible 'Cladding Systems'
- Senior ICC Engineer Talks Grenfell and Impact on Codes
- FSC has developed a comprehensive resource for appropriate, code-compliant use of foam sheathing materials on building envelopes at www.continuousinsulation.org.
- To promote compliance and enforcement, a list of NFPA 285 compliant assemblies by FSC member manufacturer is available at www.drjengineering.org/system/files/drj/ter/node/56/drr120204foamintypeiivconstruction.pdf
-  Beitel, J., Spiewak, B., Code and Fire Test Requirements for Foam Plastic Insulation Used in Exterior Walls, ICC Building Safety Journal, August 2010, http://bsj.iccsafe.org/august/features/code_and_fire.html
-  DrJ Engineering, Foam Plastic Insulating Sheathing Products in Exterior Walls of Type I, II, III or IV Construction, January 2016, www.drjengineering.org/system/files/drj/ter/node/56/drr120204foamintypeiivconstruction.pdf
-  Beitel, J. Fire Requirements for Foam Plastic Insulation and WRBs in Exterior Walls, Durability + Design, 2012, www.durabilityanddesign.com/webinars/
-  Crandell, J.H., Continuous Insulation for Code-Compliant, High-Performance Exterior Walls, RCI Interface, January 2012, www.rci-online.org/wp-content/uploads/2012-01-crandell.pdf
-  Wieczorek, C.J., Grenfell: The Perfect Formula for Tragedy, FM Global, 2017, www.fmglobal.com/insights-and-impacts/2017/grenfell-tower-white-paper,
-  BRANZ, Fire Performance of Exterior Claddings, Fire Code Research Reform Program, April 2000. http://www.abcb.gov.au/Resources/Publications/Research/FCRC-Fire-Performance-of-Exterior-Claddings
-  White, N. and Delichatsios, M. (2014). Fire Hazards of Exterior Wall Assemblies Containing Combustible Components, Fire Protection Research Foundation, www.nfpa.org/foundation