Definitions for

**"Roof Slope"**The angle made by the roof surface plane with the horizontal plane and expressed as the amount of vertical rise for every twelve inch (12") horizontal run. For instance, a roof that rises four inches (4") for every twelve inch (12") horizontal run, is expressed as having a "four in twelve" slope; often written as "4:12." Expressed as a percentage, the slope would be 33%, which is equal to 4 divided by 12. Also known as the Pitch of a roof. For more information on Roof Slope, click here.

The angle of roof incline expressed as the ratio between the rise (in inches) and run (in inches). Example: a roof that rises 4" for every 12" of run is expressed as 4:12. Run: The horizontal distance from the eaves to the point directly under the ridge.

The angle formed by the roof surface plane with the horizontal plane of the building. Expressed as the amount of vertical rise for every twelve inches of horizontal run. For example, a roof that rises four inches for every twelve inch (12") horizontal run, is expressed as having a "four in twelve" slope; often written as "4:12." Expressed as a percentage, the slope would be 33%, which is equal to 4 divided by 12. Also referred to as the Pitch.