How Do You Measure The Slope Of A Roof

Roof pitch calculator results explained.

How do you measure the slope of a roof.

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. Calculate the rafter length substituting these values into the following formula. Let s say it is equal to 1 5 m. Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level.

Roof slope style. Angle the angle of a roof is the same as the roof s slope except instead of being. But you still need to have the rise and the run to find the degree angle if you don t already know it. 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 run always remains constant at 12 inches. Either way let s see how you can calculate the slope of a roof without using a roof slope calculator. Measuring the slope from the rafters. 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.

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. A flat roof has a slope of 2 in 12 or less. Measure the run length it is the horizontal distance between the roof ridge and the wall of the building. Measure the rise of your roof.

Let s assume it is equal to 6 m. If you do know the roof slope in degrees then all you have to do is find the secant using a scientific calculator. A low slope roof is anywhere from 2 in 12 to 4 in 12. It is often compared to slope but is not exactly the same.

The easiest way to do this is by accessing a rafter in your attic if you can. First measure 12 inches from one end of the level and make a mark. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. That is the roof s rise.

Outside of the u s a degree angle is typically used. Access one of the rafters then take the measurement this way. There are two main categories of roofing. After measuring the slope estimate the roof pitch by dividing the slope by 2 if you have a simple gable roof.

However if you have a more complex roof you. For example if the. Measure from the end of the level up to the bottom edge of the rafter. To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil.

If you can t get to your attic you can measure slope on your rooftop as long as it s safe to go up there. Use a level against the underside of the rafter you.