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Polyiso听board insulation offers one of the highest R-values per inch of any insulating material available to the commercial market, making it an attractive option for many builders. However, unlike fibrous insulations听such as听mineral wool or fiberglass that are inherently non-combustible,听polyiso听is a plastic foam, making it more likely to burn. As a result, one of the most common questions we get about our听polyiso听boards,听AP鈩� Foil-Faced Foam Sheathing听and听CI Max庐, is听whether or not听it can be used in a
non-combustible or rated wall assembly.听听

To navigate this question, we must first explore how insulation materials are tested for fire resilience. Since exterior insulation,听like AP鈩� Foil-Faced Foam Sheathing or CI Max庐,听is not the only component in a wall system,听the material must be tested听as part of a complete听wall听assembly using the NFPA 285 test method.听This helps ensure that the material is tested in the same manner that it would be installed and used in a real-world application.听The objective of this test is to听evaluate how well exterior wall assemblies with combustible components听can听resist flame听spread. The goal听is to ensure听that buildings will be built in a manner that听limits flame propagation through the exterior wall of a building during a fire.听听

The NFPA test exposes complete wall assemblies to controlled flames to explore how quickly and under what conditions the flame spreads听through听the assembly. During this test, researchers look听not only听at how far the flames spread but听also at听how the wall components听are听impacted by the flames听as well as听the temperature rise within the assembly.听They are looking to verify that the insulation material,听as well as the wall components,听remain mostly intact with minimal melting or charring.听听

AP鈩� Foil-Faced Foam Sheathing听and CI Max have each been听approved for use听in 9 different wall听cladding assemblies.听During the听NFPA 285听testing,听3.5鈥� of AP鈩� Foil-Faced Foam听Sheathing听or 3.5鈥� of CI Max was听installed听as continuous insulation for use under the cladding systems listed below:听听

1. Brick: Standard 4 inch thick听听
2. Stucco: Minimum 戮 inch thick听听
3. Stone Veneer:听Minimum 2-inch thick; limestone or natural stone veneer听听
4. Terra Cotta Cladding:听Minimum 1 录 inch thick; any terracotta cladding system听听
5. Precast Concrete Panels or Concrete Masonry Unit (CMU):听Minimum 1 陆 inch thick听
6. NEW听Autoclaved-Aerated Concrete (AAC) panels听
7. NEW听Thin Brick System:听Minimum 戮-inch thick听听
8. NEW听Uninsulated Fiber Cement Board:听Minimum 录-inch thick听听
9. NEW Solid Metal Panels: Minimum 3-mm thick; steel, aluminum, copper, etc.听听

The听test听assembly was constructed and tested听first听with the weakest exterior cladding system: 3mm thick aluminum panels.听 An engineering judgment was听then听made by a qualified,听third-party engineering testing firm to include additional approvals for systems with comparable or lesser听(better performing)听fire propagation characteristics. This is industry standard听practice听for developing听a听greater scope for each assembly test. The objective is听to afford designers the widest palette of materials to use with a significant safety factor applied.听

AP鈩� Foil-Faced Foam Sheathing and CI Max听exceeded听all NFPA 285 test requirements.听As a result, we can听confidently听say that using JM鈥檚听polyiso听insulation boards as one of the components in an NFPA 285 tested and approved wall assembly, will meet听the most restrictive commercial听building code requirements.听听

This听testing听allows building designers to capitalize on the excellent insulating properties of听polyiso听insulation听boards under a variety of different听exterior听veneers, including solid metal panels,听with the knowledge that they will be in full compliance with the latest听building fire codes.听As听designers and architects look for new ways to improve building efficiency, materials with exceptional
R-values, like听polyiso听insulation boards, will help pave the way for more energy-efficient structures. By using tests like NFPA 285, we can help听build safer wall assemblies that help maximize听the energy efficiency of the building.听听

For more information about NFPA 285 approved wall assemblies, please visit 听听