Outdoor lights mounted on the face of a wall are vulnerable to damage from water. Whether you are installing a new light or performing periodic maintenance, caulking (silicone/construction silicone/construction silicone sealant/building silicone/window glass silicone) ensures the wiring and connections inside the wall are protected from possible electrical shorts. Electricians and maintenance technicians use similar procedures when caulking outdoor lights at wood or masonry walls. The job is not complicated and in most instances, the average do-it-yourself enthusiast can accomplish it in a relatively short time.
Turn off the circuit breaker that services the outdoor light. Check with a non-contact circuit tester by removing the light fixture's bulb and inserting the tester into the empty socket. The tester flashes or chirps when there is a live wire.
Stand a stepladder at the area of the light. Unscrew and remove the remaining flood lamps or bulbs from the light fixture. Set these aside.
Loosen the screws that secure the light fixture in place with a screwdriver. Hold the fixture with one hand and remove the screws. Pull the light fixture away from the wall and hold it steady as you thread the screws back into the mounting holes. This prevents losing the screws and makes them convenient when it’s time to reinstall the fixture.
Unscrew the wire nuts at the wiring connections by hand. Set the nuts aside. Untwist each of the light wires from the electrical circuit wires and set the light fixture aside. With most outdoor lights, the white, black and red wires connect to similar wires inside the wall.
Fit a tube of exterior caulking in a caulking tube. Cut the tip of the tube with a utility knife to make a 1/4-inch opening. Apply a generous bead of caulking onto the rim at the back of the fixture. Set the caulking gun aside.
Reattach the wires from the light to the corresponding wires at the electrical circuit with the saved wire nuts. Tighten the nuts securely by hand.
Remove the screws from the mounting holes. Align the light fixture with the mount and press the rim onto the face of the wall. Hold it in place with one hand and thread the screws through the face of the fixture and into the mounting holes. Tighten the screws with the screwdriver.
Reinstall the flood lamps or bulbs into the fixture. Turn on the breaker.
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