Roof Pitch Multiplication Factor

Step 1 multiply 20 and 40 which equals 800.

Roof pitch multiplication factor.

There are lots of advantages that you can get by having pitched roof on your house as compare to flat roof. Step 2 find the value of 7 12 from the roof slope multiplier table which is 1 16. In our example the roof pitch was calculated as 9 12 which has a factor of 1 25 in the table. If the home measures 20 x 40 and has a 7 12 roof then to calculate the slope of the roof follow these steps.

From the roof pitch factor table note down the roof pitch conversion factor corresponding to the roof pitch calculated. The combination of two numbers are used to display or show the roof pitch. Multiply the result by the factor and this is the length of the roof from base to ridge. In order to calculate roof pitch find every inch the roof will rise for every 12 it runs or spans.

Looking at the chart the factor is 1 0541. If you have already decided that you are going to have pitched roof on your house then you have made a nice decision. To find the roof pitch you need to place a level across the top ridge with a 12 mark that rests directly above the center top of the ridge. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

Pitched roof provide you protection again heavy rains. Step 3 multiply step 1 and step 2 i e. For example suppose you have a 4 12 pitch roof and the width of the house is 28 feet. Roof pitch factor calculator.

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. 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. Then you ll be able to measure slope from an unfinished attic space under the roof. 800 multiplied by 1 16.

The roof pitch factor will help in figuring out the exact roof estimate. You need to first figure out the dimensions of the roof by multiplying the length with width to calculate the square footage. Dividing the house width by two equals 14 feet.