How To Find Slope Of Roof

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.

How to find slope of 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. Roof slope style. The run always remains constant at 12 inches. Generally roof pitch is calculated from the same formula that describes a right triangle.

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. 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. Rafter rise run from the pythagorean theorem. The most precise way to find the roof s slope is by measuring it from the underside.

There are two main categories of roofing. Calculate the roof slope. 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. Angle the angle of a roof is the same as the roof s slope except instead of being.

You can use the following equations to find the length of the rafter and the slope. Rise run pitch where pitch is expressed in percent. Roof pitch calculator results explained. It is often compared to slope but is not exactly the same.

If this isn t practical then perform the same measurement on the underside of. Access one of the rafters then take the measurement this way. A flat roof has a slope of 2 in 12 or less. A low slope roof is anywhere from 2 in 12 to 4 in 12.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. How to calculate roof pitch. Locate the level s 12 inch mark. 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.

To do this simply convert the rise and run as a fraction to a decimal form eg. Write the roof slope as the ratio of rise over run or vertical distance over horizontal distance. That is the roof s rise. 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.

If it doesn t have this mark use a tape measure to locate. First convert the pitch to a slope. Use a level against the underside of the rafter you re measuring to get the most accurate value. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.

There are a number of ways that you can calculate the roof slope of your home and you need to be aware of this. Conventional slope roof range between 4 in 12 and 8 in 12.