How Do You Determine The Slope Of A Roof

Rafter rise run from the pythagorean theorem.

How do you determine the slope of a roof.

First enter the value of the rise and choose the unit of measurement from the drop down menu. So if your roof rises 4 inches for every 12 inches of horizontal length then the pitch of your roof is expressed as 4 12. The 7 means that the roof rises 7 for every 12 it runs. The example to right shows 2 different ways to determine or calculate roof pitch also called roof slope.

A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. The slope of your roof is the ratio of the vertical distance or rise of the roof to the horizontal distance or run. How to calculate roof pitch. You can measure with twelve feet or twelve yards but in this article we will use twelve inches.

There s no need to simplify them. Rise run pitch where pitch is expressed in percent. Then enter the value of the run and choose the unit of measurement from the drop down menu. A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible.

Here are the steps to follow for the roof angle calculator. Degrees to pitch rise in run determine the area of the roof s footprint which is the area covered by the roof regardless of slope or the apparent area of the roof when you look straight down at it like from a satellite. Pitch tan angle where angle is the roof pitch expressed in degrees. Example a the measurements are taken from on top of the roof.

Just write down the measurements you found. Finally enter the value of the rafter length and. The way pitch also known as roof slope is measured is rise over run. To do this you will need to write down the measurements that you have taken from the rafters.

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. The slope of your roof is the ratio of vertical distance rise to horizontal distance run. For example when a roof has a slope of 5 12 the roof is 5 inches high for every 12 inches long. Another way of stating this is that the roof has a rise of 5 and a run of 12.

Simply mark a level at 12 hold it perfectly level and measure from the roof surface to your 12 mark this. To accurately calculate the area of your roof you must first determine its slope or pitch.