Fire resistance ratings indicate how long a building material or assembly can withstand exposure to fire without losing its structural integrity. These ratings are typically measured in hours and are determined through standardized testing methods. Common materials, such as gypsum board and concrete, are often assigned specific ratings based on their performance in fire tests. These ratings help architects, builders, and safety officials ensure that structures meet safety codes and regulations. By understanding fire resistance ratings, they can select appropriate materials for different parts of a building, such as walls, ceilings, and floors, to enhance overall fire safety.