The panels can be made of plywood fiberboard and metal.
Framing roof overhang soffit.
This video will.
If needed paint the cornice to match the soffit.
When designing a gable end eave without a return the dimensions to look at are the width of the trim set between 6 in.
Wide especially when the eave overhang is less than 12 in.
Nail the cornice panels to the ends of the soffit.
To 18 in depending on the style of the building.
Before the roof sheathing goes on the open framing provides easy access for attaching the return blocking and the nailers for the rake soffit.
Avoid gable ends that are over 8 in.
The last pieces to go in were nailing blocks above the ledger for the back of the return and at the bottom edge of the soffit for attaching the rake 20.
Thick and the overhang from the side wall set between 12 in.
Measure and cut a cornice panel to fit over the open ends of the soffit.