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CertainTeed Vinyl Siding Installation Guide
68
Using Restoration Millwork
®
in Place of
Vinyl Accessories
Installing outside corners
Flash the corners of the home by bending a 20" wide piece of
aluminum trim coil 90° so you have two 10" legs. Cover the entire
length of the corner, lapping the upper pieces over the lower
pieces. (Self-adhering flashing may be substituted for trim coil.
Follow manufacturer’s installation instructions and observe local
building code requirements.)
Position the outside cornerpost with the top of the post 1/8" from
the underside of the eave and the bottom of the cornerpost 3/4"
below the starter strip. Make sure posts are straight and true
before fastening. For advice regarding fastening, please refer to
“Restoration Millwork Installation Guidelines” (RM003), available
online or where Restoration Millwork is sold.
NOTE: It may be necessary to shim or furr out the corners
and/or window casings to get the proper pocket height.
Always use shimming/furring materials, like Restoration
Millwork, that will not rot or decay.
Installing Trimboards around windows
Flash the window according to the manufacturer’s specifications.
Once the opening is properly flashed, begin by measuring
the width of the bottom edge of the window and, using this
measurement, cut the first section of Restoration Millwork. Apply
this piece to the bottom of the window, verifying each end of the
section lines up with the edge of the window prior to fastening.
To determine the length of the trim along the sides of the window,
measure each side of the window starting at the top of the window
and dropping down to the bottom edge of the first piece of
millwork applied. Using these measurements, cut the second and
third sections of Restoration Millwork. Apply these pieces to the left
and right sides of the window, verifying that the top edge of each
section lines up with the top of the window and the bottom edge
of each section lines up with the bottom edge of the first piece of
trim already applied.
To determine the length of the top piece of trim, begin at the left
side of the left piece of trim and measure to the right side of the
right piece of trim. This measurement should equal the width of
the window plus two times the actual width of the trimboards
being applied. Cut the final piece of trim and apply it at the top of
the window, again verifying that the left and right edges of the cut
section line up with the left and right edges of the trimboards in
place at the sides of the window.
Once the top section of millwork is in place, apply flashing in
compliance with local building codes.
measure
width of
window for
first piece
flashing
top of
window
bottom of
window
measure from
left side of
trim to right
side of trim
optional
J-Pocket
flashing
shim
corners
to create
proper
pocket
height