Most wall sconces come with all the necessary hardware for mounting which is usually a strap with a center stud.
How to install light box in wall.
Position the light fixture over the box and attach it with either mounting screws or a decorative cap threaded onto the mounting post the method will depend on the style of your fixture.
If the box does not come with a cardboard template hold its face.
If the drywall or plaster is damaged cut a larger hole and install a box that attaches directly to a stud or joist.
Included in the tutorial are tips for making the box installation go much smoother and faster so you will be up and running quicker.
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You may need to fine tune the depth of the mounting post by screwing it in or out.
For your safety turn off power before starting this project.
Clamp cable to the wall box tugging gently to make sure the clamp is tight.
To install the box push it into the hole in the wall enlarging the hole with a utility knife if needed.
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Secure box to wall.
How to install a light fixture box in a wall without attaching to a stud duration.
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Tighten the screws until the box is firmly attached.