Roof Slop Vs Roof Pitch: How To Measure Roof Slop

Roof Slop and Roof Pitch

Both roof slop 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 slop and rooftop pitch, and the contrasts between them, because slop and pitch are not same. Since Slop influences how rooftop frameworks are introduced, including directing which kind of rooftop covering material can be connected, seeing how to gauge the slop 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 slop of the rooftop.


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 roof slop 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.



Slop 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.

Slope Ratio

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

The slop can also  be stated numerically as a proportion. The slop 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 slop.

Roof slop can be describe as:

  • Ratio
  • Inches per foot


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

Roof Slop Chart

Diagram Interpretation

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

How to Measure Roof Slop

To measure roof slop 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 slop 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 slop from the rooftop surface will be imprecise without the utilization of something to make a level surface from which to quantify the slop. 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 slop of the rooftop.

measurement of slopConclusion:

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

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