Roof Pitch Multipler

The first thing that you need to understand before picking any selections from a roof pitch multiplier chart is to ensure that it s affordable.

Roof pitch multipler.

The total run is the distance from the peak to the edge of the roof which in this case is the total width divided in half which is equal to 10 feet or 120 inches. Multiply the area to be covered by the roof by the roof slope factor to find the total surface area of the roof. The maths behind this number is that it is the square root of rise run 2 1. Text surface area of roof area covered by roof roof pitch multiplier 600 1 08 648 square feet.

Accurate roof calculations are achieved using this table and all you need to do is measure the roof width and length and then you are ready to do a roof pitch measurement. Understanding the roof pitch chart process. Just multiply the roof width by roof length and then the result should be multiplied by the use of the pitch multiplier. After safely measuring your roof to discover the pitch you can use the graph below to calculate your roof pitch in degrees and multiplier.

If the roof has multiple pitches such as those found on dormer windows or porches you will need to draw these separately. A flat roof has a pitch of 1 meaning the material needed is 1 times the size of the roof. The multiplier is again 1 08. 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.

For this example let s continue to assume that the pitch will be 5 12. Simply multiply this number by the area covered by a sloped roof to obtain the total surface area of the roof itself. After drawing the perimeter of the roof add a new drawing layer with the plus symbol found in the bottom right corner. Let s assume that the area is 600 square feet.

This is useful since the area of the roof itself is often difficult to measure by hand. 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. What is the multiplier. Based on the pitch you can use the multiplier to determine the amount of material needed for a roofing project.

Then proceed to draw the surface area of the roof that has a different pitch. Typically the steeper the roof is the higher the price will be. Since pitch is the rise over a 12 inch run divide the run by 12 to get the multiplier in this case 120 12 10.