20 12 Pitch Roof

If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks.

20 12 pitch roof.

Multiply 20 and 40 which equals 800. The roofing materials most often used for these pitches include asphalt composite shingles. Low slope roofs are from 0 to 3 12 in 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.

The table below shows common roof pitches and the equivalent grade degrees and radians for each. This tops anything i have seen in 25 years of roofing duration. If the home measures 20 x 40 and has a 7 12 roof then to calculate the slope of the roof follow these steps. The steep roof of the tropical papua new guinea longhouse for example sweeps.

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. A great many residential roofs fall into this category. The worst roofing job ever. Find the value of 7 12 from the roof slope multiplier table which is 1 16.

West coast roofer roofing and roof repair 3 572 624 views. Multiply step 1 and step 2 i e. The value arrived at 928 reflects the square feet of the roof. Notes to the table above.

Traditional 3 tab shingles made with asphalt composite are the most popular type of shingle and are the most flexible in terms of adapting to many roof pitches. Arctan 3 12 14 0 the primary purpose of pitching a roof is to redirect water and snow. The exact roof slope in degrees is given by the arctangent. Steepest roof i ve ever done.

Some sources consider low slope to include 3 12 pitch roofs. After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually. 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. Any ideas on the best way for my guys to attack a job like this.

November 19 2014 10 42pm 1. 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. 4 12 to 20 12 pitches.