There are many ways different ways to get an accurate roof measurement, one includes climbing on your roof. Luckily, there’s more than one way to measure a roof.
Steps On How To Measure a Roof
Typically, people climb on top of the roof and measure each section. This method gives you the most accurate roof measurements. If you are afraid of heights or ladders, you can measure the roof from the ground.
Although measuring from the ground is not as precise, this method still provides a good estimate. In some instances, you may need to use a ladder to reach certain parts of the roof. Let’s get started.
Draw a Sketch of the Roof on Paper
Once you draw a diagram of the roof and label each section. Make sure each section has the measurements written next to it. This will help you track what you have measured and what you need to measure.
Determine the Area of the Roof’s Triangular-Shaped Sections
The formula for calculating the triangle’s area is 1/2 (LxW). Measure all of the roof’s triangles. Measure the length starting at the eave’s center to the opposite end. Then measure the length of the eave. Next multiply the two measurements and divide that number by 2. Write this number on the corresponding areas of the diagram.
Find the Square Footage of the Rectangular Sections
Grab a tape measurer and measure the width and length of the rectangular sections. Multiply these two measurements. This number is the square footage of that rectangular section. Write this measurement on your diagram.
Calculate the Roof’s Total Square Feet
Look at the diagram’s sections and add up all of those numbers. The number you calculated is the roof’s total amount of square feet.
Determine the Amount of Materials Needed
The square footage of a roof is not what determines the amount of roofing materials needed. The number of “square” roof has determined this number. To figure the “square” of a roof, you divide the roof total square footage by 100.
Get the Measurements of the Four Sides of the Home
Taking measurements from the ground use a measuring tape to find out the length of the house’s sides. Make sure to make an allowance for all overhangs. Add the measurements together and place these calculations on the diagram.
Find the Total Square Feet
Find the total number of square feet you calculated for every section and add the numbers together. This sum of these sections is the number of house’s square footage. The number is not the square footage of the roof.
Determine the Number of Squares of the House
The square of the roof is calculated by taking the total number of the house’s square feet and dividing it by 100.
Figure Out the Roof’s Pitch
The pitch is a measure of the roof’s steepness. It is calculated by dividing the roof’s rise by its run. Start from the roof’s edge and move over 12 inches. Twelve is the run. Then figure out the number of inches of the roof line. Use the slope multiplier from the chart below.
Roof Pitch Slope Multiplier Chart
2 in 12 = 1.102
3 in 12 = 1.134
4 in 12 = 1.159
5 in 12 = 1.191
6 in 12 = 1.230
7 in 12 = 1.274
8 in 12 = 1.322
9 in 12 = 1.375
10 in 12 = 1.432
11 in 12 = 1.493
12 in 12 = 1.554
Find the Final Roof Calculation
Multiply the ground level square figure by the slope multiplier. This number is the roof square.