Roof Slope Factor Chart

On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length.

Roof slope factor chart.

The rise and the length. Once you ve figured out the pitch of your roof you can consult the following chart to discover the slope factor and hip valley factor. Multiply this amount by the slope factor 960 1 1180 1073 28. Multiply the roof length by the gable wall length 40 24 960.

Roof pitch angle and slope factor charts. Most commonly a roof pitch will be from 0 flat to 12 45. A roof pitch multiplier also called a roof pitch factor is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof. The area of a hip roof equals the area of a gable roof with the same dimensions.

Download the slope chart pdf. Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter. The combination of two numbers are used to display or show the roof pitch. This will give you the rise over run or pitch.

The area of this roof 1073 3 sq. Finding the slope and hip and valley factor. Roof pitch is a term describing how steep or flat your roof slope is. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

Valley hip factor. Roof pitch angle and slope factor chart for tile shingle slate and metal roofing. For roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1.