Installation Guide

window and door trim
accessories installation
With the mantel already mounted to
the wall, pencil a center line on the
top and bottom of both the mantel
and keystone.
Using the drill jig provided with the
keystone, place on the mantel’s top
edge and align slotted holes over the
penciled center line on the mantel.
Drill 1/4" holes through hole pattern
of drill jig. Repeat second set of holes
on bottom edge of mantel. (Fig. 1)
Install the keystone clips making sure
end “A” is inserted first, then snap in
end “B”.
Slide clip back 1/16" to ensure
clamping legs are fully locked into
place. (Fig. 2)
Position the keystone using the center
line as the guide and snap it into
place starting at one end of the top of
the keystone. You may need to trim
the sides of the keystone when using
dentil cover strips. (Fig. 3)
NOTE: When installing keystone over
two-piece mantel, make sure mantel
pieces are cut to equal lengths. Use
the cut ends to form the center line
for clips and keystone. Caulk bottom
ends then install.
Pencil
Line
Pencil
Line
Fig. 1
A
A
B
B
Fig. 2
Fig. 3
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Installing Long Length Mantel System Keystones