A.Jay Meunier responds: Ideally, the snap-ties should be broken back so that the ends are 1 to 1 1/2 inches from the surface of the concrete. Then the holes around the snap-ties should be plugged with hydraulic cement to prevent moisture from entering through capillary action. This should prevent rust from bleeding through and staining the stucco coat.
It sounds in your case like the concrete contractor used the kind of snap-ties that are designed to break off at the surface of the concrete. These are fine if the intention is to cover the foundation wall with a drain board or foam insulation system. But there are also special ties available that will break off below the surface. Next time you...
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