14 12 Roof Slope Factor

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.

14 12 roof slope factor. This will give you the rise over run or pitch. 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. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. The combination of two numbers are used to display or show the roof 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. 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. The hip and valley factor varies according to the slope of the roof as shown in the table below.

Although there s isn t any standard pitch of a roof used on all kinds of sloped roofs you can determine the range of pitches by using a roof angle calculator and by considering factors like the local climate and roofing materials. The roof slope factor chart also consists of conversion factors to determine the slope of the roof. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. For example if you measure 4 inches the pitch of your roof is 4 12.

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. You can easily find roof pitch factor chart online from where you can take help in calculating pitch factor for your 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. 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.

If this isn t practical then perform the same measurement on the underside of. For a 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 for the slope of the adjacent roof sections.