Frame
expander
Mark frame expander at
the center of the wedge
Center frame expander
6E
Notch out
1/4”
D. Install wood blocking between the top of the window and the soffit as shown. The
blocking should be ush with the exterior of the window frame.
E. Notch the retainer leg of the top and bottom frame expanders. Hold the frame expander
so it is centered on the center window, and mark the frame expander at the center of the
wedge that is between the windows. Cut a 1/4" wide notch out of the retainer leg to allow
the frame expander to bend and attach to the anker windows.
Backer rod
and sealant
6H
Double-hung bay window
Accessory groove
Exterior jamb cover
Sealant
F. Apply a bead of sealant on the leg of the head frame
expander and install by tapping on using a block of
wood with rounded edges and a hammer.
G. Install the bottom frame expander by tapping on with
a block of wood with rounded edges and a hammer.
H. Insert backer rod into the space between the jamb cover
and the exterior nish material as deep as it will go. Apply
a bead of high quality exterior grade sealant on top of the
backer rod. Shape, tool and clean excess sealant. When
nished, the sealant should be the shape of an hourglass.
Note: Backer rod adds shape and depth for the sealant
line. is method creates a more flexible sealant line
capable of expanding and contracting.
I. Apply a corner bead of sealant across the top of the head
frame expander. Shape, tool and clean excess sealant.
J. Install the interior jamb extensions (provided).
K. Install roofing material per the manufacturer’s instructions.
