What is a roof slope in construction?

Definition of Roof Slope: roof slope is the amount of (vertical) change in height as a ratio of horizontal distance traveled, also expressed as inches of rise per foot of horizontal run, or cm of rise per m of horizontal run.

What is the slope of the roof?

The slope of a roof, often referred to as the pitch, is determined by “rise over run” – the roof’s vertical rise in inches for every twelve inches of horizontal length (the run). So a roof with four inches of rise every 12 inches horizontally (run) would have a slope of 4/12 (sometimes displayed as 4:12).

What is a 1/12 roof slope?

Roof pitch is often expressed as a ratio between rise and run in the form of x:12. For example, a pitch 1:12 means that per every twelve yards of building length the rise will be equal to one yard.

What is the difference between roof slope and pitch?

The pitch is the measurement of the rise of the roof to the span of the roof and is expressed as a fraction. … The slope is the measurement of the rise of the roof to the run of the roof, and is expressed as inches per foot in a ratio format.

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What is a 3/12 pitch?

Roof pitch is represented in inches rise of 12 inches run. For example a “3 pitch” or “3 in 12 pitch” or “3/12 pitch”, all mean that the roof rises 3 inches, for every 12 inches of it’s horizontal run. … A roof can also be measured in degrees.

Is there a minimum roof pitch?

Traditionally, a minimum roof pitch of 20° was recommended in BS 5534, but modern tiles and slates have now been designed for applications as low as 15°. It is uncommon to find a roof below 15° but for those very low pitch applications, there are interlocking clay pantiles available, suitable for use down to 12.5°.

Is a 4/12 roof pitch good?

As well, a slope of 4:12 is most commonly considered the lowest slope for “standard shingle installations”. Most manufacturer and industry recommendations require, or at the very least recommend, special underlayment or other considerations on roofs between 2:12 and 4:12.

What does a 1/12 pitch mean?

1 over 12 is the lowest of the low slopes. You’ll often find a 1/12 pitch on back patio porches or at the top of an older gambrel roof. 2 over 12 is a little steeper than a 1 over 12 pitch, but not by much. In degrees, low slopes are between 4.76 degrees and 9.46 degrees.

What is the most common roof pitch?

The most commonly used roof pitches fall in a range between 4/12 and 9/12. Pitches lower than 4/12 have a slight angle, and they are defined as low-slope roofs. Pitches of less than 2/12 are considered flat roofs, even though they may be very slightly angled.

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What does a 4/12 pitch mean?

A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a “4 in 12” slope. … The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run. For example, a “4 in 12” slope can be expressed as the ratio of 4:12. A “6 in 12” slope is expressed as 6:12.

How do I calculate the pitch of a roof?

The angle, or pitch, of a roof is calculated by the number of inches it rises vertically for every 12 inches it extends horizontally. For example, a roof that rises 6 inches for every 12 inches of horizontal run has a 6-in-12 pitch.

Is a 3/12 roof pitch good?

Any roofs up to 3:12 are generally considered “low slope.” In the residential arena, we see lower slope roofs as part of the home’s architectural design. … Then, when you get into roofs of 3:12 or greater pitch, most other metal roofs can be used and that generally is the pitch requirement for asphalt shingles as well.

What is the steepest roof pitch you can walk on?

Common Roof Slopes Expressed in Rise/Run and Angle + Slope expressed as Grade

Common Roof Slopes Expressed in Rise/Run and Angle + Slope expressed as Grade
Roof Slope Expressed as Rise / Run in Inches Roof Slope Expressed as an Angle Walkability
3 / 121 14.04 ° Easy to walk on
4 / 12 18.43
5 / 12 22.62 °

What roof pitch is 25 degrees?

Roof Slope in Degrees to Standard Roof Pitch Conversion Tables

Convert Roof Slope from Degrees to Rise-in-Run
Roof Angle in Degrees Roof Slope as Rise-in-Run (X-in-12)
25° 5.596 in 12
26° 5.853 in 12
27° 6.114 in 12
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How does roof pitch affect cost?

A slope of 6/12 could add nearly another thousand dollars to the price. If you were to choose a 9/12 slope, the national average for a 40 by 50-foot roof would be more than $8,300. A high slope of 12/12 could cost $10,000 or more.

Roofs and roofing