Construct hawk mobiles with a wingspan of about 22 inches and a length of 11 inches. The best materials are cardboard, Styrofoam or light plywood. Paint them black, or another dark color. Hang two hawk mobiles from the eaves on either side of the damaged area. Allow the wind to blow the strips, pinwheels and pie tins freely.
Some research suggests that mirrors frighten woodpeckers.
Predmore recommends fastening them flat against the wall next to the damaged area. The theory is the woodpecker will see his own image and think it is another bird's territory. Owl images generally are unsuccessful for frightening woodpeckers. Where woodpeckers are persistent, use two or more of the visual frightening devices simultaneously. Because some birds drum to produce noise to attract mates, deadening the sound-producing area by filling the hollow space behind the wood sometimes works to discourage them.