Prominently displayed house numbers on a home make your home safer because emergency service personnel, such as paramedics, police and firemen, can locate your home easier at a time when every minute counts. If your home has wood siding on the exterior, it's a simple matter to attach numbers with wood screws, but if your home's exterior is stucco, the process is a bit more involved. Stucco is essentially a blend comprised mostly of cement, and you will need special tools to install the numbers without damaging the finish.
Hold the numbers in place on the stucco and mark the wall where the screws will be placed.
Determine the depth needed for the drilled holes. The holes should be drilled 1/8-inch deeper than the depth of the screws that will be used to attach the numbers.
Measure the required depth on the 1/4-inch drill bit and place a piece of masking tape around the bit at the correct depth. This will allow you to hit the correct depth with every drilled hole.
Drill holes in the stucco using a hammer drill and the 1/4-inch bit. Make sure the drill bit is perpendicular to the wall and that you drill straight into the wall. If you do not own a hammer drill or have access to one, you can rent them at home improvement stores.
Blow the drilling dust out of the holes with a blower, air compressor or turkey baster. Be careful not to get dust in your eyes.
Squeeze silicone caulk into the screw holes. Do not apply so much caulk as it runs out of the hole.
Place 1/4-inch plastic screw anchors in the drill holes and allow them to sit for a couple of hours for the caulk to dry.
Attach the numbers to the house using stainless steel screws. Stainless steel screws will not rust, so you can avoid discoloration on your stucco.