What is a B15 fire rating?

A B15 fire rating refers to a classification system used to indicate the fire resistance of building materials, specifically walls, floors, and ceilings. In this system, a B15 rating signifies that the material can withstand fire exposure for a minimum of 15 minutes before failing. This rating helps ensure that structures provide adequate time for occupants to evacuate and for fire services to respond. It is commonly used in commercial and residential building codes to enhance safety.