I am thinking maybe the foundation under the brick is cool enough to condense out moisture in this location. For example, if the foundation under the brick is at 65 degrees but you have muggy weather with dewpoints 70 and higher, the moisture in the air will condense out. If this is indeed happening, somehow getting sun to this location so the surface under the brick can warm up above the dewpoint would cause the condensation to stop. But then again, if you are in an area with such hot muggy weather, your foundation is probably pretty warm too.
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