SMALL AREA OF STUCCOthe stucco will
have to be removed all the way to the wall surface and rebuilt in
layers. (Follow the steps in the project after this one.)
This simple repair method works well for damaged areas that are less
than two square feet. For more extensive damage,
Matching the texture and color is the trickiest part of stucco
repair. Stucco comes in many different finishes. The best thing to
do is play around with the finish, be creative, and keep playing
until you get the best match.
How to patch a small area of stucco:
1. Begin by removing any loose material
with a wire brush. Use the hammer and chisel or a knife to undercut
the stucco surrounding the damaged area so that the patch will be
securely locked in.
2. Use the brush to clean rust from any
exposed wall and to remove any stucco knocked loose in undercutting.
Also make sure the surface is free of all dust and dirt.
3. Paint the broken edges of the stucco
with bonding adhesive, which will improve the bond between the old
stucco and the stucco patch. (Another option is to thoroughly wet
down the damaged area and keep it damp for 12 hours before patching
to prevent the moisture from being drawn too quickly from the patch
and weakening it.)
4. Apply premixed stucco with a putty
knife or trowel, slightly overfilling the hole.
5. Read the manufacturer’s directions,
since drying times vary. Feather the edges until the patch blends
into the surrounding surface.
6. Use a whisk broom, washcloth, or
trowel to duplicate the original texture. This is probably the most
difficult part of the project, but don’t despair! Have patience and
keep playing around until you get the texture you are looking for.
Let the patch dry for several days, and then touch it up with
masonry paint, matching the color to the rest of the stucco.
REPAIRING A LARGE AREA OF STUCCO
Typically, Mother Nature will cause most of the damage to stucco,
but this damage is usually small cracks. Larger dam age is usually
caused by us—tripping with a ladder, getting the car too closes, all
of those pesky accidents that we later curse ourselves about.
Duplicating stucco textures takes patience, skill, and experience,
so it’s a good idea to practice before taking on a major repair.
This might be a great project to hire a professional (HAP).
How to repair a large area of stucco:
1. Remove the old stucco by making a
starter hole with a drill and a masonry bit, then using a masonry
chisel and hammer to chip away all the stucco in the repair area.
2. Cut the self-turning metal lath,
which looks like a metal screen. Ask your hardware store personnel
to help you find it. Attach it to the sheathing with roofing nails.
If it takes more than one width of lath, overlap the pieces by 2
inches. If the patch extends to the base of the wall, attach a metal
stop bead at the bottom so the stucco can’t leak out.
3. Premixed stucco works well for small
jobs, but for large ones, it’s more economical to mix your own.
Combine three parts sand, two parts portland cement, and one part
masonry cement. Add just enough water so the mixture holds its shape
when squeezed. Mix only as much as you can use in about an hour.
4. Apply a 3 thick layer of stucco
directly to the metal lath. Push the stucco into the mesh until it
fills the gap between the mesh and the sheathing. Important: Don’t
fill the hole completely—you will need to apply two more layers
after the first one has cured.
5. Score horizontal grooves into the
6. Let the stucco dry for two days,
misting it with water every 2 to 4 hours to help it cure evenly.
7. Apply a second, smooth layer of
stucco. Build up the stucco to within ‘4 inch of the original
surface. Let the patch thy for two days, misting as before.
8. Combine finish-coat stucco mix with
just enough water for the mixture to hold its shape.
9. Dampen the patch area, and then
apply the finish coat to match the original surface. The finish coat
was dabbed on with a whisk broom then flattened with a trowel.
Dampen the patch periodically for a week. Let it dry for several
more days before painting it.