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CertainTeed Vinyl Siding Installation Guide
50
Lineal Application around Windows
Measure the top 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.
Use a triangle to create a 45° angle or measure 3-1/2" in from
the locking leg.
NOTE: The nail flange is always the longest part of a
surrounding miter.
Use snips to remove the part as shown.
Cut a 3/4" rain tab (as shown).
Snap the completed top lineal into the previously attached
starter strip.
NOTE: The bottom miter of side lineals has the same
cut as both ends of a top lineal.
3-1/2"
45°
3-1/2"
remove
cut for
rain tab
back-side
view of
mitered lineal
rain
tab