How To Measure Roof Slope


Roof Slope and Roof Pitch

Both standard roof slope and pitch show the rise of a rooftop. It is expressed as an extent of the horizontal to the vertical. This article portrays both rooftop slope and rooftop pitch, and the contrasts between the because slope and pitch are not the same. Since standard roof slope influences how rooftop frameworks are introduced, including directing which kind of rooftop covering material can be connected, seeing how to gauge the slope of a rooftop might be significant to a home controller.

Please, keep in mind that, as per the International Standards of Practice for Performing a General Home Inspection, the examiner is not required to gauge the standard roof slope of the rooftop.

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Measure roof slop and pitch

The above illustration demonstrates a basic gable rooftop and the general connection between rise, run and traverse. In fact, rooftop surrounding is a viable utilization of geometry. The standard roof slope is relying to a great extent on the properties of a precise triangle.

In rooftop confining, the base of the right triangle is known as the run and the run is the separation from the outside of the divider’s top plate to a point specifically beneath the focal point of the edge. The vertical leg of the triangle is known as the rise, which is the separation the rooftop beam board expands upward over divider’s top plate.



A slope is the angle of the rooftop and it is stated as a proportion of the vertical ascent to the flat run, where the run is some bit of the length. This proportion is constantly articulated as inches per foot.

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Roof slope calculator

A rooftop that ascents 4 inches for each 1 foot or 12 inches of a run are said to have a “4 in 12” slope. In the event that the ascent is 6 inches for each 12 inches of run, then the rooftop slope is “6 in 12.”

The slope can also  be stated numerically as a proportion. The slope proportion denotes to a specific measure of vertical ascent for each 12 inches of even run. For instance, a “4 in 12” incline can be communicated as the proportion of 4:12. A “6 in 12” incline is communicated as 6:12.

Roof SLop ratio

The triangular image over the rooftop line in this building gives information about the roof’s slope.

Roof slope can be describe as:

  • Ratio
  • Inches per foot

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Pitch is the rise of the rooftop stated as a portion derived by separating the rise by the traverse. Where as the rooftop traverse is the separation between the outside of one divider’s top plate to another.

Pitch Fraction

Traditionally “roof pitch formula” implied a proportion between the edge tallness to the whole traverse/width of the building or proportion between the beam length to the building width. Furthermore, in those days, the edge was in the center of the traverse. This is not true anymore in present day building rehearses. The edge can be placed anywhere in the traverse, from specifically center to either traverse endpoint.

A rooftop that ascents 8 feet over a 24-foot traverse was said to have a “1 to 3” minimum roof pitch. On the off chance that the ascent is 4 feet over a 24-foot traverse, then the rooftop pitch was said to be “1 to 6.”

The pitch can be demonstrated numerically as a part or section. The pitch section states a specific measure of vertical ascent over the whole traverse. For instance, given a rooftop with an ascent of 4 feet and a traverse of 24 feet, the pitch is “1 to 6” pitch, which can be communicated as the portion of 1/6. A “12 to 24” pitch is described as 1/2.

The words “pitch” and “slope” are frequently utilized conversely, which is mistaken. They don’t mean a similar thing. Slope gives more important information than pitch, as characterized in this article.

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Roof Slop Chart

Diagram Interpretation

Utilizing the representation above and data, we simply found out about roof slope and pitch. we can see that a 2:12 slope can be described as 1/12 pitch, expecting the traverse is double the length of the run. On the off chance that the slope is 4:12, the pitch for the 24-foot traverse is 1/6. On the off chance that the pitch is 1/3, the slope is 8:12. Keep in mind, the slope is described as a proportion and in inches per foot. Also, the pitch is a portion inferred by isolating the ascent by the whole traverse.

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How to Measure Roof Slope

To measure roof slope you need following things:

  • Pencil
  • Carpenter’s level
  • Tape measure


  • Measure 12 inches  from one end of the level and make a stamp.
  • You can take dimensions from the incomplete attic space under the rooftop or at the rake board zone, or on top of the rooftop covering materials. Measuring the roof slope from the rooftop surface may not create the most exact estimation due to the innately uneven surface of the rooftop covering.
  • Creep into the incomplete upper room space. Find a rooftop crossbeam board that is promptly available to you. Put the finish of the level against the base edge of a rooftop beam and hold it impeccably level. Then measure from the 12-inch check on the level vertically to the base edge of the rafter. That estimation is the quantity of inches that the rooftop rises in 12 inches.
  • Find a rake board that is promptly open to you. Keep the craftsman’s level flawlessly level while holding the end against the base edge of the rake board. Measure from the 12-inch check on the level vertically to where the measuring tape touches the base edge of the rake board. That estimation is the quantity of inches that the rooftop ascends in 12 inches.
  • Measuring the rooftop slope from the rooftop surface will be imprecise without the utilization of something to make a level surface from which to quantify the slope. The application of a 48-inch woodworker’s level or a straight 2×4 board might be helpful to make a smooth surface that mirrors the slant or slope of the rooftop.

measurement of slopConclusion:

Always keep in mind that roof slope and roof pitch don’t mean the similar thing. A slope is a proportion measured in inches per foot. Since slope influences how water is shed from a rooftop surface and decides the cutoff points for utilizing black-top shingles, seeing how to gauge the slope of a rooftop might be a treasure to a home auditor.

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