(pronounced FI(ehr) RAY-tehd)

Municipal building codes mandate minimum fire ratings for particular situations, and if these rules are not followed, projects will not pass inspection and/or can cause harm to the structure’s users. The term “fire rated” refers to the UL (Underwriters Laboratories) fire resistance rating of an assembly, which can be a variety of things. A ceiling assembly, for example, could include the structural components, suspension system, ceiling panels, light fixtures, and diffusers. A wall assembly could include the structural members, gypsum board, insulation, and glazing. A door assembly could include the door itself, the associated hardware, and the door framing. You get the picture. Each of these assemblies is fire rated differently and required for certain building applications.