Info on Stucco and Plastering-January, 2015 - forty-first issue
Re-doing a bad stucco job without tearing it all off.
Thanks for the great website! I have an old "renovated" home. When the
renovation (addition and 2nd floor) was done 12 years ago, stucco was put
on VERY POORLY. Moisture from snow on the driveway has crept up and the
stucco is peeling away on the bottom 2-3 feet. Also, the expansion joints are
terrible looking - bits of barely covered metal showing. There is also a
bump at the back of the house where the metal grid is showing and is
"growing" out of the house!
So... is there anything I can do to repair this or do I have to do a
complete new stucco job. Does the old stucco have to come off completely
or can new stuff be reapplied? How can I get rid of the expansion joint?
This all can be repaired and new stucco reapplied
without tearing it off. Tearing off is a huge project.
The mortar that is peeling needs to come off to the lath.
There should be a gap at the bottom of the wall between the stucco and the
slab.
Here we left about a 2" gap (scroll down to the scallops):
When I went to Southern California in 1991, the building code required
a 4" gap at the bottom.
The bottom should be cut off up to about 4". If any framing is exposed
it should be covered with flashing. The bottom of
the stucco needs to be defined with a metal weep screed.
Those ugly expansion joints are supposed to have the metal exposed.
1.
Cut off the bottom with an angle grinder or skil saw with a diamond
blade. Pull off the lath and stucco and put on a metal flashing if
there is exposed wood framing. Put on a weep screed.
2. Rip out the expansion joints.
3. Check all windows for flashing and cut off
stucco and flash if needed
4. Cut out bulge and put on new lath.
5. Apply a bond coat with an acrylic admixture and
portland.
6. Apply a new color stucco finish to the whole
house
7. Find some one to do the stucco that is worth a damn.