Before You Begin
Exterior shutters should be scaled and proportioned to the size of the window and appear to be functional. They should be at least as tall as the window and ideally half its width so they look like they'd cover the window when closed. Measure your windows and keep these proportions in mind when shopping for shutters.
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Step 1 : Mark the locations
Hold a shutter next to the window and align its top edge with the top of the window trim. Mark the location against the siding. Put a carpenter's level on top or along the side of the shutter to make sure that it's level. If not, the shutter should be aligned with the window.
Step 2 : Predrill the shutter holes
Predrill installation holes in the corners of the shutter using a 1/4-in. drill bit. For shutters under 55-inches high use four holes (fasteners) placed in the corners. For larger shutters place an additional set of holes (fasteners) along the outside edges in the center of the shutter.
Step 3 : Fasten shutters to the siding
Hold the shutter against the siding and drill through the shutter into the surface 2 3/4-in. deep. Use a hammer to gently tap the fasteners to snug the shutter against the siding.