Stucco Cracks

Stucco Crack Repair

What Causes the annoying stucco cracks!

Incorrect Mix:
Stucco is made of water, a binder, and a construction aggregate. The most common type of stucco is cement plaster style stucco. If the cement and the sand base are not mixed in correct proportions, the end result ends up being weak. With the rise and fall in temperature, the weak stucco will develop cracks and begin to peel off the wall and ceiling. If the stucco on your wall has been applied in an even layer and you can’t find a problem with the application, the stucco has probably been mixed incorrectly. The old stucco may have to be peeled away and a new layer applied.

House Settling:
House settling is a common cause of stucco cracking. House settling generally occurs in old homes, or homes built in areas with loose soil. The loose soil gives in to the pressure the weight of the house exerts, causing the house to settle lower. Incorrect backfilling techniques are also responsible for house settling.

Faulty Install:
It’s common to see small cracks in the surface of the stucco even if the stucco has been recently applied. But these cracks are sealed over as soon as the application is complete, usually by paint. While this may alarm you, it’s actually not an indication of a faulty install. If the cracks are too large, however, you should be worried. Also, if the paint starts to peel off early, it’s a sign of faulty install.

Faulty install of the stucco, in addition to the above, can mean several things like incorrect location of expansion joints, lack of control/expansion joints, a finish coat is applied before the base coat has had a chance to dry out, problems with the wall like an incorrect deflection criteria, loading or installing an interior drywall after the stucco has been applied, incorrect loading of the structure or the roof before the lath is installed, incorrect installation of the lath base, incorrect spacing between base sheathings, incorrect thickness of applied stucco or any one of these gaffes can cause your stucco to develop large cracks early in their lifecycle.

High Winds:
Stucco that has been recently applied is vulnerable to cracking because of high winds. High winds can suck away the moisture from the recently applied stucco. This causes the remaining stucco to shrink and develop small cracks, which can grow larger with time. This type of cracking is known as shrinkage cracking.


Repair Procedures.

Special coating and sealants:

Removal & repair of stucco system: