Exterior Plaster Water Damage
Whenever you see bubbles or blisters forming on exterior stucco walls,
there's a good chance and I mean a really good chance that moisture will
have accumulated in the stucco and remained there for a long period of time,
eventually creating bubbles or wall blisters like these.
Moisture can
come from the ground, air or even from parts above the damaged area.
The best way to fix this type of damage will be to scrape off the
powdery substance that was the exterior coating. Then it wouldn't be a bad
idea to grab a wire brush and scrape as much of the loose mortar or plaster
off as you possibly can.
Now for the bad news, if you start to see
stucco lathing wire or building paper, then the damage might be a little
more severe than you anticipated. If this is the case, the paper or wire
might be damaged also and will need to be removed and replaced.
After
this is done, you can re-stucco the damaged area and fill all of the low
spots in with stucco mortar. After you've let that dry for a few days, you
should be able to apply the color coat stucco finish.
If you're going
to paint this area, let it dry for at least seven days, unless paint or
building product manufacturer suggests otherwise. Always follow the
manufacturer's instructions.