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CertainTeed Vinyl Siding Installation Guide
78
To install, lock the bottom of the cut panel into the panel below.
Push the top edge into J-channel or undersill trim. Tabs will catch
in the trim and hold the panel firmly in place.
NOTE: Since you will not nail this last course, it is important
that the tabs fit properly in the trim to provide support while
allowing movement for expansion.
Finishing the top course
To finish the top course of siding, attach cornice receiver to the top
of the wall under the eave or soffit. Trim the top panel to within 1/4"
of the cornice receiver. Using a nail slot punch, punch nail slots
1/4" from the trimmed edge of the siding panel, 16" apart. Nail
off the top course, and snap the cornice molding into the cornice
receiver. An alternate method is to use J-channel and furring strips.
Completion
Attaching objects to siding
All external products (downspouts, shutters, and lights, for
example) are attached to walls after you’ve applied the vinyl siding.
NOTE: All external fixtures must be attached to a solid
backing (such as 3/4" exterior grade plywood) to provide
a secure mounting surface. Never attach a fixture directly
to vinyl siding.
When installing external products, you must allow for expansion
and contraction of siding.
You can allow for this movement in two ways:
The most convenient way to attach light fixtures is with light
blocks. Because they contain receiving channels to hold siding
panels, light blocks provide a simple way to allow for expansion.
When attaching other fixtures, drill holes in the siding 1/4" larger
than the diameter of screws, bolts, or nails being used to fasten
objects. This provides adequate clearance so the siding can move
freely underneath attached objects. When attaching objects, do
not fasten tightly. It is also recommended that you apply caulk
around the screws.
Fitting at light blocks
When cutting panels to fit at a light block, be sure to allow
for expansion.
1/4"
1/4"
cornice
molding
1/4" to 3/8"
for expansion
light block
mounting
bracket
1/4"
from
edge