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It is most often expressed as a ratio of inches of rise per 12 inches of run. A roof slope that rises 4 inches for every 12 inches of run is a "4 in 12" slope, or 4/12 slope, or 4:12 slope.

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Q: How do carpenters and architects express roof slope?
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What is the angle of slope in a roof called?

The pitch of the roof.


What is pitch in a roof?

Pitch is a bitumen or it can mean the slope of the roof for example 1/8" per foot fall


Why would you ever need to know slope or rate of change in the real world?

The "slope" of the graph of any quantity tells how fast that quantity is changing. Any quantity that changes in real life has a slope. -- The slope of the car's odometer reading is the car's speed. That slope is so important that a separate meter, called the "speedometer", is provided to show it. -- The slope of the speedometer reading is the car's acceleration. -- The slope of a road, track, or trail is called the "grade". Hikers and railroad drivers always want to know the grade, because it tells them whether they'll be able to make it past that piece of track or trail, and whether they'll need to get a running start. -- People who build roads with curves have to be careful of what kind of slope they build into the curves. If the slope of the pavement in a curve is wrong, then every car on the curve flies off of the road. -- Carpenters too. If the slope of the roof on a house or a building is wrong, then the rain and snow don't run off fast enough, and the roof caves in.


What is the slope in degrees of a roof with a rise of 12 and a run of 12?

45 degrees.


How do you find the slope of a roof on a rectangular prism?

Divide the shapes, so you're left with a triangular prism, and a rectangular prism. Calculate the slope of the triangle as per usual.