How to Guide

Exterior Storm Window
Insallation Instructions
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BLINDSTOP MOUNT INSTALLATION
OVERLAP MOUNT INSTALLATION
OPENING WIDTH
OPENING WIDTH
GLASS
BRICKMOLD
MOUNTING
FLANGE
BLIND STOP
GLASS
BLIND STOP
BRICKMOLD
MOUNTING
FLANGE
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TOOLS REQUIRED
Electric/cordless drill
Phillips screwdriver bit
Caulk gun
3/32” drill bit
Utility knife
Pliers
Tape measure
For additional information on storm windows and
installation, go to www.LARSONdoors.com/windows
If your model includes an adjustable expander, slide the expander
onto the bottom of the window unit. (The bottom mounting flange
does not have round pre-punched installation holes).
Apply caulk to the head (top) and jambs (sides) of the existing
window where the storm window will be mounted. To allow for
proper drainage, DO NOT caulk the sill.
Set the storm window in place, ensuring it is square, centered in
the opening and that the frame does not bow toward or away from
the center of the window. Predrill a 3/32” pilot hole through each of
the holes in the mounting flange, and secure window with the
provided screws.
Adjust the expander (if applicable) so that it makes even contact
across the window sill.
Position the storm window over the opening to check for a proper
fit. Use caution when handling the window to ensure the glass
panes stay within the frame.
If your storm window is too large, the mounting flange can be
trimmed. Determine how much of the flange to remove. Using a
utility knife, score the mounting flange along the appropriate grove.
Bend the flange back and forth with pliers until it breaks off.
JAMB JAMB
STORM WINDOW
JAMB JAMB
STORM WINDOW