# Roof Framing

## Run, Roof Slope, Gable Height and Gable Area

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### Run

Run can be calculated as:

*R = S / 2 (1)*

*where *

*R = run (ft, m)*

*S = span (ft, m)*

#### Example - Run

The run of a roof with 60 feet span is

*R = (60 feet) / 2*

* = 30 feet*

### Gable Height

Gable height can be calculated as

*GH = R VR (2)*

*where *

*GH = gable height (ft, m)*

*R = run (ft, m)*

*VR = vertical rise (in/ft, cm/m)*

### Example - Gable Height

The Gable Height of a roof with 30 feet run and vertical rice 6 inches per foot, can be calculated as

*GH = (30 feet) (6 inches/foot)*

* = 180 inches*

* = 15 feet*

### Gable Area

Gable Area can be calculated as

*GA = GH R (3)*

*where *

*GA = gable area (sq.ft, m ^{2})*

*GH = gable height (ft, m)*

*R = run (ft, m)*

### Roof Slope

Roof slope is the ratio between the vertical rise and the horizontal run:

*RS = y / x (4)*

*where *

*RS = roof slope*

*y = vertical rise (in, m)*

*x = horizontal run (in, m)*

In the United States, slope is typically given in inches per 1 foot or as a ratio of inches per 12 inches and is often referred to with units of "pitch". Ex.

*4 in 12 *

*or *

*4 pitches, 4:12 pitch*

In metric countries it is common to use degrees or 10 or 100 as denominator. Ex.

*21.8%*

*or*

*4:10*

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