Let us understand the terms used in roofing slope calculations with the below-given drawing.
1. Rafter:
The distance between the ridge of the roof to the external edge of the wall surface.
2. Span:
The horizontal distance between the roof supports up to the bottom end of the roof rafter.
3. Rise:
The vertical distance between the top end of the wall or roof supports & the ridge of the roof.
4. Run:
The horizontal distance between the ridge of the roof & the external edge of the top plate of the wall or roof supports.
In other words, the run is half of the total span.
Run = span /2.
5. Pitch:
The vertical rise over the horizontal run is said as the pitch of the roof. The pitch of the roof is calculated in the number of units it rises vertically for every 12 units of horizontal extension.
For eg., a roof that rises 4 units for every 12 units of a horizontal run has a pitch of 4 / 12.
6. Overhang:
The extra length of the roof rafter extends beyond the external edge of the wall or roof support.
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