Roof Pitch Explained

The pitch of your roof is determined by the measurement of the vertical rise by the horizontal run.

Roof pitch explained.

Roof pitch is the rise of the roof over the run of the roof. Even flat roofs aren t completely flat because they must be constructed at a very slight incline so rain can be directed away from the roof. The steeper the roof the more quickly it will be able to shed rain and other debris. The rafters equal the span.

Commonly used roof pitches were given names such as greek. The rafter length is 3 4 the span about 48. The roof pitching is essentially how steep the roof is going to be they are either going to be flat or pitched. The numerator or first number refers to the vertical height measurement of the roof.

The ridge height is 2 9ths to 1 3 the span an angle of 24 to 34. For example if a roof is 8 feet high and spreads out from the center covering 12 feet in each direction the rise over the run would be 8 12. The denominator or second number denotes the horizontal length measurement of the roof. The ridge height is 1 9 to 1 7th the span an angle of 12 5 to 16.

The rise is the height of the roof from the base to the top. So let s say a roof rises 6 inches for every 12 inches in depth towards the peak. Roof pitch explained a roof s pitch can be thought of as its slope.