What causes grout cracks, and how do I know if they’re the result of sinkhole damage?

Sinkholes and sinkhole activity are associated with the movement of soils, into areas created after the underlying rock is dissolved. When the rock beneath the home deteriorates, it weakens and fails to provide the support needed from the initial construction of the home, causing grout cracking, among other problems.

In so doing, the house no longer sits on a level, competent base but instead is prone to shifting, settling, cracking, and even heaving, as the weight distribution in the foundation occurs. This is why sinkholes may actually cause some portions of the home to appear to rise, as the foundation is pushed upwards toward the sky. This is because another, less prominent area is shifting down and causing the other area to rise.

Grout Cracks in Some Counties Are More Suggestive of Sinkhole Activity

For most homeowners, the damage can be very subtle. In counties where sinkhole damage is common – such as Marion, Hernando, Pinellas, and Pasco – homes are most likely to present cracking in unusual places, such as at wall joints in the interior, or in stucco on the exterior of the structure. The significance of this is that the home is losing the support provided by the soil beneath the home, causing the perimeter to shift and crack.

Observing grout cracks in a “stair step” formation on the exterior of the home along the grout lines of block is a significant sign of sinkhole activity. While counties or cities like Marion or Ocala often have other, plausible explanations for such damage (e.g. expansive clay, organic soils, loose surface soils), these alternative explanations do not rule out sinkhole activity as a cause. Most often, these kinds of other causes are working side by side, to create the appearance of sinkhole damage.

What is a sinkhole, according to Florida law?

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