Pitch Factor For Roof

Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot.

Pitch factor for roof.

Roof pitch and corresponding angles. For example if you measure 4 inches the pitch of your roof is 4 12. 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. There are many websites which are offering this facility.

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. 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 whole table of roof pitch and slope gives a conversion factor so as to obtain a numerical figure of the slope. Another option that is available for you in finding the pitch factor for your roof is to find roof pitch factor calculator online.

One medium to describe the roof pitch is in 12 runs. A roof pitch multiplier also known as a roof pitch factor is a number that when multiplied by the area covered by a sloped roof gives the actual area of the roof. Conventional roofs are the easiest to construct and you can walk on them safely. They have a pitch ranging from 4 12 to 9 12.

For this example suppose the roof is 20 ft wide measured from the roof. You just need to go to any of those websites and there insert the required information and they will tell you your roof pitch factor. The maths behind this number is that it is the square root of rise run 2 1. Look up the multiplier in.

This will give you the rise over run or pitch. This numerical figure is significant as not everybody can understand the technical measurements. 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. 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.

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. A a roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch. You can also calculate roof pitch even without using a roof slope calculator. Here let s assume the pitch is 6 12.

This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Step by step example using the roof pitch factor table measure the dimensions covered by the roof.