Roof Cut Factor

Pitch is thus the ratio of the rise in inches to a 12 inch run and is often expressed using a semicolon for example 6 12.

Roof cut factor.

This way the pitch of the roof and the slope of the roof can be measured. Pitch of roof slope factor valley hip factor. A a roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch. A 7 5 variance of waste on a 30 square roof would be 2 33 squares.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Hip and valley factor rafter length in decimal feet. Knowing how to make this calculation will make your roof construction project easier and will ensure the safety and success of your roofing project once completed. 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.

An angle cut is a very common cut needed for constructing rafters for any roof. With the saw bevel angle set to 45 cutting hips and creepers at the plumb cut angle will produce correct side angles. When outfitting your residential or commercial structure with products from everlast roofing it s important to know the incline or pitch of your roof. This roof slope factor table also consists of hip and valley factors to measure the possible hips and valleys.

Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. 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 picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7. Download the slope chart pdf.

That s because it is the smaller cut up hip roofs that can often have the highest waste percentage. That s 500 to 600 variance on the estimate. Note the word large wasn t included. The length of the rafters can also be determined while determining the slope.

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. The higher the slope the steeper it is. Length of the rafter. Multi level complex roofs are difficult to estimate.

The combination of two numbers are used to display or show the roof pitch.