1 8 pitch is given so 24 x 1 8 equals 3 or unit of rise in inches.
Roof overbuild framing.
To provide a framework for the new trusses nail 2 by 6 inch strips of wood around the perimeter of the roof.
Over framing is when you frame a roof section on top of another roof section such as when joining a l shaped roof with each section at right angles to each other etc.
Or if you want to raise the roof a bit more install fascia around the roof perimeter attached to the new soffit and nail the new roof deck to crown molding above the fascia.
Box beam gable framing new gable overhang is framed in the form of a box beam hanging off of a new layer of roof plywood roof sheathing cantilevered over the top of the 3 layers of rigid insulation.
Use of rafters trusses and a truss base polyline are demonstrated architectural home design software.
The exposed edges of the 3 layers of rigid insulation are no longer exposed.
If the unit of rise in inches is 3 then the cut is the unit of rise and the unit of run 12 inches or 3 12.
Figure 2 2 roof framing terms.