Wolverine Siding and Vinyl Carpentry Soffit and Decorative Trim - Manual (Page 9)

Corner Starter Strip
Secures 3-1/2" and 5" lineals and a corner insert to the
outside corner.
New Construction Window and Door Starter
Butts up against protruding window and door jambs and
overhangs for installation of 3-1/2" and 5" lineals.
Remodeling Window and Door Starter
Holds 3-1/2" and 5" lineals in place around window and door
openings. Used in re-siding applications where existing
casings have not been removed.
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Wolverine Fit and Finish Installation Guide