To limit the probability that the collapse of a structural framing member attached to or supported on the firewall will lead to failure of the firewall, which could lead to the spread of fire from an adjacent building to the building, which could lead to harm to persons in the building.
To limit the probability that the collapse of a structural framing member attached to or supported on the firewall will lead to failure of the firewall, which could lead to the spread of fire from the building to an adjacent building, which could lead to harm to persons in the adjacent building.