# How do you calculate the angle of a lean to roof?

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## How do you find the angle of a lean to roof?

To find the angle of a roof in degrees, convert the pitch to a slope, then convert to degrees by finding the slope’s inverse tangent, or arctangent. First, convert the pitch to a slope. To do this, simply convert the rise and run as a fraction to a decimal form, e.g. rise/run = rise ÷ run = slope.

## How much slope do I need for a lean to roof?

To guarantee water drainage, a roof should have a slope of at least 1/8 inch per foot of horizontal run, but that’s a bare minimum. A slope of 1/4 inch per foot is better and specified by some building codes.

## What angle should my roof be?

For most home styles, roof pitches fall in a range 4/12 (a moderate) slope up to 8/12 (fairly steep). Examples of extreme slopes range from 1/4:12 (almost flat) to 12/12 (sloping down at a perfect 45-degree angle).

## How do you find the angle of a pitch?

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.

## How do you calculate a roof?

Multiply your house length by your house width to get the area. (For example, 40 feet x 30 feet = 1,200 square feet.) Next, multiply the area by your roof’s pitch. (1,200 x 1.05 = 1,260 square feet.)

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