How to Measure
Other than Roof Pitch and
Span, the most importand measurement need to match an existing
roof is called the heel height.
Simply, it is the "thickness"
of the truss or rafter measured from the outside of the wall
from the top of the top plate to the underside of the
Below are two diagrams to help
illustrate the point
Height and Overhang for a Trussed Roof.
Height and Overhang for a Stick Framed Roof