How To Find The Slope Of A Roof

When you want to replace or repair your roof you need to know about the slop of the roof the reason for this is the simple fact that roof slope can affect the overall cost of replacing or repairing the roof.

How to find the slope of a roof.

Rise run rise run slope. Access one of the rafters then take the measurement this way. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. If this isn t practical then perform the same measurement on the underside of.

To do this simply convert the rise and run as a fraction to a decimal form eg. How to convert roof pitch to degrees. Write the roof slope as the ratio of rise over run or vertical distance over horizontal distance. Calculate the roof slope.

The most precise way to find the roof s slope is by measuring it from the underside. Roof pitch calculator results explained. If it doesn t have this mark use a tape measure to locate. First convert the pitch to a slope.

To find the angle of a roof in degrees convert the pitch to a slope then convert to degrees by finding the arc tangent of the slope. Once you know the roof slope multiplier for a particular slope you can use it to find the actual area of any size sloped roof with the same slope. Use a level against the underside of the rafter you re measuring to get the most accurate value. 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.

This forms an angle of 18 5 between the horizontal section and the roof and creates a gentle incline that is seen as a midpoint between a low pitch and medium pitch roof. 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. So in this case for every 12 inches the roof goes across horizontally b while rising 6 inches a there s actually 13 416 inches of roof c. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

Locate the level s 12 inch mark.