CertainTeed Vinyl Siding Installation Guide
51
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.
window or
door frame
1/2"
3-1/2"
3/4"
view of above notches
from back side of lineal
rain tab shown bent into
receiving pocket of side lineal
window
frame