Figuring Out Slope Of Roof

Write the roof slope as the ratio of rise over run or vertical distance over horizontal distance.

Figuring out slope of roof. Access one of the rafters then take the measurement this way. For example if your tape measure found a 6 inch vertical distance to the 12 inch mark on your level the slope is 6 12 or 6 in 12. Learn more about finding the angle of a line using our slope calculator. How to measure roof pitch.

Calculate the roof slope. 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. Outside of the u s a degree angle is typically used. Measuring the slope from the rafters.

Slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run this is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. It is often compared to slope but is not exactly the same. Roof pitch calculator results explained. You will need to express this size in terms of square feet.

To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil. Most roof s have a pitch in the 4 12 to 9 12 range. If you are trying hard to work out how to figure roof pitch measurements the calculator takes away all of those problems for you more or less instantly. Keep in mind that the average size of a roof is 1 700 square feet so your total will likely be 10 higher or lower than this figure.

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 first step in a free roofing estimate is measuring the roof dimensions. To avoid this problem from occurring you should always look for a roof pitch calculator to help you take things a step further. Either way let s see how you can calculate the slope of a roof without using a roof slope calculator.

Common roof pitches and equivalent grade degree and radian angles. Knowing the pitch of your roof is useful when designing an addition installing skylights or cutting new rake boards. In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches. The most precise way to find the roof s slope is by measuring it from the underside.

The minimum roof pitch for shedding snow is around 30 or a 6 12 or 7 12 slope although this is not a definite as the material of your roof the direction of the snow and wind are some factors that can affect whether or not snow will slide as roofs of as little as 10 have been reported to shed snow. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.