When it comes to installing metal roofing, one of the most important steps is to measure your roof’s length, width, and rise for one section. To get the rise, you’ll measure the distance between the lowest point of your roof and the highest point. From there, you’ll use the measurement of the rise to get the slope which is calculated by dividing the rise by the run (the distance across the roof). Next, you’ll compute the slope factor by squaring the rise number and adding it to the run’s measurement. After that, you’ll take the square root of that sum and divide it by the run. Finally, you’ll multiply the slope factor number by the area measurement which will give you the square footage for that section and consequently, the amount of material you’ll need to cover it. You’ll need to repeat this process for each section.