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 a 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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