Roof pitch refers to the steepness or angle of a roof, typically expressed as a ratio of the vertical rise to the horizontal run. For example, a roof with a pitch of 4:12 rises 4 inches for every 12 inches it extends horizontally. This measurement helps determine how water drains off the roof and influences the overall design and aesthetics of a building. Roof pitch is important for various reasons, including structural integrity and energy efficiency. Steeper roofs often shed snow and rain more effectively, reducing the risk of leaks and water damage. Additionally, different pitches can affect the amount of usable space in an attic or upper floor.