Wolverine Siding and Vinyl Carpentry Soffit and Decorative Trim - Manual (Page 44)

Measure the height of the window or door. Add 7" (for
the 3-1/2" header and bottom lineal) and cut.
NOTE: Add additional material if using 5" lineals.
Trim a minimum of 3/4" from the top end of the side lineals.
Snap the side lineals into place, making sure the rain tabs of
the top lineal are bent down into the receiving pocket of the
side lineals.
If the lineal surrounds a window frame, the bottom corner
requires a 45° miter as done previously for the top lineal.
NOTE: Rain tabs are not required here.
window or
door frame
window
frame
rain tab shown bent into
receiving pocket of side lineal
view of above notches
from back side of lineal
1/2"
3-1/2"
3/4"
43
Wolverine Fit and Finish Installation Guide