The fire-resistance rating of an exterior wall is determined based on which of the following?

The fire-resistance rating of an exterior wall is influenced by both fire separation distance and the story location within the building.

Fire separation distance refers to the distance between the exterior wall of a building and the property line or another building. This distance is crucial because it affects the level of fire exposure that the wall may encounter. A greater separation distance usually allows for less stringent fire-resistance requirements, as there is a reduced risk of fire spreading from one building to another.

The location of the wall in terms of which story it is on also plays a significant role. Different floor levels in a building can experience different levels of fire hazards, and specific codes often dictate the necessary fire-resistance ratings for walls based on their position. For example, walls on lower levels may need to withstand more significant fire exposure due to potential risks from vehicle access or outdoor activities.

By considering both these factors, codes ensure that buildings are adequately protected against the spread of fire, enhancing overall safety. Therefore, the correct answer encompasses both elements that contribute to determining the fire-resistance rating of an exterior wall.