Mounting screws to exterior stucco is similar to mounting a screw to masonry or brick. Stucco is a hard material that is applied to the exterior of a house, which takes the place of siding. Mounting a screw to this material will require making a hole, but a screw that is driven directly into stucco will not hold adequately and may fall out over time if not properly attached.
Mark the location of the screw on the stucco with a pencil or felt-tip marker.
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Hold your drill with a masonry drill bit at the mark and perpendicular to the outside wall so the hole will go straight in.
Drill very slowly into the stucco, which prevents the stucco from chipping. Blow into the hole to remove dust and debris.
Apply a small amount of caulk to the inside of the hole.
Place a screw anchor into the pre-drilled hole. Tap the end of the anchor to gently force it into the hole.
Insert a screw into the anchor and tighten it with a drill with a screwdriver bit or use a screwdriver. Leave the head sticking out of the stucco far enough to accommodate what you want to hang from the screw, such as wire or a plant hanger.