Installation Instructions
CertainTeed Vinyl Siding Installation Guide
52
Measure the bottom of the opening and add 7" (3-1/2" extra 
for each side) if the side lineals are also 3-1/2". Add 10" total 
if using 5" lineals.
Trim 3/4" tabs from the lineal as shown.
Snap the lineal in place and secure by nailing (or stapling) it 
through center of the nail slots.
window 
frame
3-1/2"
3/4"
3/4"
view of 
notching 
from back 
side (same on 
both ends)
finished 
assembly 
with side 
lineal










