What You Need

Tools: Caulking gun, disposable paintbrush, putty knife or trowel, whisk broom, wire brush

Materials: binding adhesive, concrete caulk, denatured alcohol, metal primer, premixed stucco, masonry paint.




Material taken from
Black and Decker "Home Repair"

Although stucco siding is very durable, it can be damaged, and over time can crumble or crack. Fill thin cracks with concrete caulk, which remains flexible and prevents further cracking. If cracks are already filled with failed caulk, remove it completely with a wire brush. When the crack is completely clean and dry, fill it with concrete caulk. Overfill it slightly, then smooth the joint, using a disposable paintbrush and denatured alcohol.



Patching a Small Area

This simple repair method works well for damaged areas that are less than two square feet. For more extensive damage, remove the stucco all the way to the wall surface and rebuild it in layers.

Begin removing loose material with a wire brush (photo A). Use the brush to clean rust from any exposed lath, then apply a coat of metal primer. Paint the broken edges of the stucco with bonding adhesive, which will improve the bond between the old stucco and the stucco material of the patch.

Apply premixed stucco with a putty knife or trowel, slightly overfilling the hole (photo B). Read manufacturer's directions—drying times vary. Feather the edges until the patch blends into the surrounding surface.

Use a whisk broom or trowel to duplicate the original texture (photo C). Let the pat dry for several days, then touch it up with masonry paint, matching the color with the rest of the siding.