Calculating Roof Slope

How to calculate roof slope?
You can calculate the roof pitch by the number of inches that it rises vertically for every 12 inches that it extends horizontally. As such, a 7/12 or 7-in-12 roof pitch means that the roof rises 7 inches for 12 inches that it runs horizontally.
Roof Pitch Calculator Results Explained
  1. 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. …
  2. Angle – The angle of a roof is the same as the roof’s slope, except instead of being represented as X/12, it is represented in degrees.

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The slope of the roof provides the rise and the run to be plugged into the equation. A roof pitch of 4-in-12 (4:12) has a rise of 4 and a run of 12.

The roof pitch factor is also used to calculate the length of common rafters. To find the total length of a common rafter, consider the run to be the horizontal distance covered by the whole rafter, from the end of the rafter tail (the part of the rafter which extends past the outside of the wall) to the near side of the ridge board.

To find the location of the heel cut, the multiplier is multiplied by the “effective run” of the rafter. The effective run is the horizontal distance covered by the rafter from the near side of the ridge board, where the head cut will be, to the outside of the wall plate, where the heel cut will be.

The Difference Between Roof Slope And Pitch

When you look at calculating roof slope, you will notice that a lot of people use the term slope and pitch interchangeably. This is incorrect as they are, theoretically different. This is important to note when you are going to be using an online calculator as it might be determining pitch instead of slope.

The slope of the roof is the ratio of the vertical distance to the horizontal distance. The pitch of the roof is a ratio of the total vertical roof height to the total horizontal distance from one wall to another. This is often stated as a ration of the rise of the roof to the span of the roof.

Why Do Steep Roof Slopes Cost More?

When you hire a roofer to replace your roof, the price of the new roof hinges on many factors. Of course, the material and style of your new roof will be major factors, but the slope of the roof will also influence the price. The reason why higher slope roofs cost more to install is safety. When roofers install low sloping roofs that are generally safe for careful walking, they don’t need to use as much high-end safety equipment to complete the job. With a high sloping roof, stability is a much bigger concern, and the roofing team may need to use specialized safety equipment to complete the job safely. High sloping roofs also require more materials. Roofs with higher slopes require more shingles to ensure complete coverage.

Roofers typically base their rates on several factors, and parts and labor are the most significant. When it comes to labor, roofers will usually charge by the day or by the hour. When they need to use more extensive safety measures to install a high-sloping roof, this will naturally take longer to complete and therefore drive up the labor cost of the project. It’s also possible that the roofer you choose to perform your installation may not have the right tools, safety equipment, or personnel with the proper training to complete the job.

As far as materials are concerned, a higher roof slope will not only cost more in shingles but also nails, roofing cement, and other materials. This, in turn, will increase the cost of labor as more nails and more cement will require more time to finish installing.

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