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CertainTeed Vinyl Siding Installation Guide
76
Install panel
If necessary to maintain the slope angle, install furring under the sill
as described on pages 31 to 32.
NOTE: You can eliminate this step by using dual undersill trim.
This trim has two receiving channels. Use the inner channel
if you’ve cut the siding panel near the locking edge. Use the
outer channel if the cut has been made near the butt edge.
Use a snap lock punch to raise tab faces on the outside of the
panel. Punch out a tab every 6".
Push the horizontal edge of the cut into utility trim. Slide vertical
edges of cut into J-channels at window sides. Make certain the
installed panel locks into the panel below.
Fitting over windows and doors
The procedure for cutting panels for installation over windows and
doors is similar to that explained earlier.
If necessary to maintain the slope angle, install furring above the
window or door as explained on pages 31 to 32.
Drop the panel into position, making certain it fits into the undersill
trim and J-channel at the top and J-channel at the sides. Interlock
the panel with the siding panels below.
Fitting at narrow openings between windows
To simplify installation in areas such as that shown in the
illustration, install J-channel on both sides of opening.
Bow the panel toward you and slip it into the channel.
If the area is very narrow, leave one J-channel unnailed except at
the lowest point (as shown). Bend this channel out slightly to insert
panel. When the panel is in place and nailed, nail the J-channel
immediately above the panel and repeat the procedure. Be sure to
leave adequate tolerances for expansion and contraction.
window
J-channel
utility trim
horizontal
siding
dual
undersill
trim
installing trimmed panels
with dual undersill trim