20 12 Pitch Roof

Notes to the table above.

20 12 pitch roof.

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. Steepest roof i ve ever done. The exact roof slope in degrees is given by the arctangent. Multiply step 1 and step 2 i e.

4 12 to 20 12 pitches. West coast roofer roofing and roof repair 3 572 624 views. Arctan 3 12 14 0 the primary purpose of pitching a roof is to redirect water and snow. 800 multiplied by 1 16.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. If the home measures 20 x 40 and has a 7 12 roof then to calculate the slope of the roof follow these steps. A great many residential roofs fall into this category. After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually.

The table below shows common roof pitches and the equivalent grade degrees and radians for each. I m starting on a job with a roof that starts as a 5 12 and slopes up to a 20 12 about 24 of it is 5 26 is 14 and 50 of the roof is at 20. The value arrived at 928 reflects the square feet of the roof. This tops anything i have seen in 25 years of roofing duration.

Low slope roofs are from 0 to 3 12 in pitch. November 19 2014 10 42pm 1. The roofing materials most often used for these pitches include asphalt composite shingles. The worst roofing job ever.

Thus pitch is typically greater in areas of high rain or snowfall. The roof pitch calculator is a convenient online tool you can use to quickly assess the pitch of your roof to determine the length of rafters you need. 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. Some sources consider low slope to include 3 12 pitch roofs.

Find the value of 7 12 from the roof slope multiplier table which is 1 16. Multiply 20 and 40 which equals 800. Any ideas on the best way for my guys to attack a job like this.