How To Figure Length Of Roof Pitch

Measure the rise of your roof.

How to figure length of roof pitch. For example if the roof rises 4 feet and the span is 16 feet twice the run then the pitch is 4 16 or 1 4. Roof slope calculator example of use. Pitch of any roof can be computed by the number of inches it grows vertically for every 12 inches it extends horizontally. Let s say it is equal to 1 5 m.

Before taking any measurements you must first confirm that it s safe to walk on your roof. Check the surface of the. For example a roof that rises 6 inches for every 12 inches of the horizontal run has a 6 in 12 pitch. Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement.

Enter the diameter of the roof ridge vent gap 1 3 finally enter the coverage area width of the panels you plan to buy. However carpenters typically make use of diverse finders of roof pitch angles an example of that is being a rafter. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. The metal roof length calculator calculates the distance from peak to trim so add the length you want the roof metal to extend beyond the eave trim.

Divide the slope by two to get the pitch. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. Take the measurement of the vertical. For a roof with the ridge above one wall the span is the same as the run.

Take a measurement of 12 inches using a level. For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally. The slope is the same as the pitch. Position your level against the roof until the bubble of the vial sits between two lines.

For example if the peak is 4 feet and the total roof with is 20 feet the total rise is 4 feet or 48 inches. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. See the image below for more explanation on rise run and pitch. Measure the total rise and run if you know the total height of the peak and the width of the roof you can also find the pitch with a little math.

Measure the run length it is the horizontal distance between the roof ridge and the wall of the building. A 12 in 12 pitch is a steep 45 degree angle roof. Common rafter elevation if you are calculating rafter length from the center of the ridge beam as shown below you will need to subtract half of the thickness of the ridge beam from the top end of the rafter. For instance a 38 panel will have an effective coverage width of 36.