How To You Find The Slope Of A Roof

The slope of a roof.

How to you find the slope of a roof.

Roof pitch is simply the slopecreated by the rafter. First convert the pitch to a slope. The slope of your roof is the ratio of vertical distance rise to horizontal distance run. Measuring the underside of the roof is actually the most accurate way of calculating the slope of the roof as there are no materials which will create an uneven surface.

Another way of stating this is that the roof has a rise of 5 and a run of 12. The rafters that will provide you with the best measurements are the rafter in the attic the overhang rafter at the end of the roof and the barge rafter which is located to the side of the gable. These can be acceptably accurate sometimes. The distance from the center of the ridge to the side dc in.

Roof pitch is often expressed as a ratio between rise and run in the form of x 12. There are also a number of smartphone apps that you can use to find the slope of your roof if you have a clear view of a gable end on the building. Finally enter the value of the rafter length and. First enter the value of the rise and choose the unit of measurement from the drop down menu.

To do this simply convert the rise and run as a fraction to a decimal form eg. Assuming the roof to be a right triangle the slope of the roof will be measured as the ratio between bd and dc. Rise run rise run slope. There s no need to simplify them.

Here are the steps to follow for the roof angle calculator. Then enter the value of the run and choose the unit of measurement from the drop down menu. 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. For example when a roof has a slope of 5 12 the roof is 5 inches high for every 12 inches long.

Just write down the measurements you found. For example if you find 4 inches of height with the tape measure at the 12 inch mark on the level your slope is 4 12 or 4 in 12. Roof slopes are measured in units of twelves. You can measure with twelve feet or twelve yards but in this article we will use twelve inches.