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Right Triangle And Roof Framing Examples
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ROOF FRAMING DEFINITIONS
Rise: The vertical distance measured from the wall's top plate to the top of the ridge.
Span: The horizontal distance or full width between the outside edges of the wall's top plates.
Run: The horizontal distance between the outside edge of the wall's top plate and the center of the
ridge; in most cases this is equivalent to half of the span.
Pitch: Pitch and slope are synonymous in modern trade language. Pitch/slope of a roof is generally
expressed in two types of measurement:
1) Ratio of unit rise to unit run * - 7/12 or 7 Inch
2) Angle of rafters, in degrees - 30.26˚
*The unit rise is the number of Inches of rise per Foot (12 Inches) of unit run. The unit run is expressed as one
Foot (12 Inches).
Plate: The top horizontal wall member that the ceiling joist and rafters sit on and fasten to.
Ridge: The uppermost point of two roof planes. This rafter is the uppermost rafter that all Hip, Valley
Jack and Common rafters are fastened to.
to clear entries in between problems.
On/C
On/C
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