14 12 Roof Slope Factor

For example suppose you have a 4 12 pitch roof and the width of the house is 28 feet.

14 12 roof slope factor.

The combination of two numbers are used to display or show the roof pitch. Most roof s have a pitch in the 4 12 to 9 12 range. Divide the rise by the run the run is 12. The table below shows common roof pitches and the equivalent grade degrees and radians for each.

A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof. 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. Looking at the chart the factor is 1 0541. The hip and valley factor varies according to the slope of the roof as shown in the table below.

Roof pitch is a determining factor for cost of the roof as well as the roof area and the type of materials used. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. 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. Dividing the house width by two equals 14 feet.

For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. For any roof slope expressed as x in 12 rise in run the hip and valley factor is determined by finding the square root of rise run 2. The roof slope factor chart also consists of conversion factors to determine the slope of the roof. Divide the rise by the run the run is 12.

The headache of using pythagoras and trigonometry can be spared by making use of these charts. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. Find the square root of the. Roof pitch 6 12 roof length including overhangs 40 gable wall length including overhangs 24 enter 6 into the calculator slope factor 1 1180 multiply the roof length by the gable wall length 40 24 960 multiply this amount by the slope factor 960 1 1180 1073 28 the area of this roof 1073 3 sq.

The length of the roof is 14 feet and three quarters of a foot or 14 feet 9 inches. A 10 slope roof should not be confused with a 10 pitch roof as a 10 slope roof means that the roof rises by ten inches for every foot of run. Multiply 14 by 1 0541 resulting in 14 75 feet. This will give you the rise over run or pitch.

For example if you measure 4 inches the pitch of your roof is 4 12.