Calculated Industries 44060 - Manual (Page 65)

User's Guide — 63
RIGHT TRIANGLE AND ROOF FRAMING
EXAMPLES
ROOF FRAMING DEFINITIONS
Rise: The vertical distance measured from the wall’s top plate to the
intersection of the pitch line and the center 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 measure-
ment:
1) Ratio of rise to run — 7/12 or 7 inch
2) Angle of rafters, in degrees — 30.26°
Unit Rise: The number of inches of rise per foot (12 inches) of run.
Unit Run: This number is expressed as one foot (12 inches). In metric
mode, or when using metric dimensions, the unit run is one meter.