Roof Slope Factor Chart

Roof pitch angle and slope factor charts.

Roof slope factor chart.

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. For example if you measure 4 inches the pitch of your roof is 4 12. Roof pitch is a term describing how steep or flat your roof slope is. The area of this roof 1073 3 sq.

The rise and the length. 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. The pitch of a roof is determined by 2 numbers.

Multiply this amount by the slope factor 960 1 1180 1073 28. Finding the slope and hip and valley factor. Multiply the roof length by the gable wall length 40 24 960. 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.

Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Roof pitch is a term used in the roofing industry to describe the angle slope of a roofing structure. 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. This will give you the rise over run or pitch.

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. Download the slope chart pdf. The area of a hip roof equals the area of a gable roof with the same dimensions.