How do Sinkholes Form?

Sinkholes are one of the major problems facing homeowners in Chattanooga. This issue is closely tied to the geology of the area. Much of Tennessee sits on limestone bedrock. While limestone is a valuable natural resource, it can create serious problems for homes and structures above it.

Limestone is porous, which means water can move through it easily. Over time, groundwater slowly dissolves the rock and creates empty spaces underground. As these voids grow, the soil above them loses support. Eventually, the surface can collapse, and a sinkhole forms.

Sinkholes generally fall into three main types.

Solution Sinkholes

These sinkholes are very common and typically form where only a thin layer of soil sits above limestone. As rainwater moves through the soil, it slowly dissolves the limestone below. Small openings form underground and may stay empty or fill with loose soil that does not provide support. Over time, these openings grow larger and can lead to a sinkhole at the surface.

Cover Collapse Sinkholes

These sinkholes occur where a thicker layer of soil or sand sits above the limestone. They can form quickly, sometimes in just a few hours. As the underground cavity expands, the soil above can no longer support itself and suddenly drops into the void below. These sinkholes are often the most severe and can cause significant damage.

Cover Subsidence Sinkholes

These sinkholes form where the soil above the limestone contains a higher amount of clay. As the limestone below begins to dissolve, the clay slowly shifts downward to fill the space. This creates a gradual sinking or depression at the surface. These sinkholes are usually less dramatic than cover collapse sinkholes, but they can still lead to structural concerns over time.

Sinkhole Remediation Services

When a sinkhole begins to form on your property, it is important to address it quickly. At American Foundation & Waterproofing, our Chattanooga sinkhole repair specialists evaluate each situation to determine the best repair method for your home or property.

We use several proven techniques depending on the conditions underground.

Compaction Grouting: Compaction grouting involves injecting a cement-based grout into the ground through a series of drilled holes. This process fills voids and compacts loose soil, helping to stabilize the area and improve ground strength.
Cap Grouting: Cap grouting is similar, but it focuses on creating a reinforced layer over the affected area. This helps distribute weight more evenly and gradually stabilizes the soil as the material bonds with the surrounding ground.
Injection Piers: Injection piers involve drilling access points and injecting a specialized grout mixture into the subsurface. The material spreads through weak areas and voids, helping strengthen the soil and improve overall stability.

Our team is committed to choosing the right solution for your specific situation. We take the time to explain what is happening under your property, why it is happening, and how we plan to repair it so you always know what to expect.

Contact American Foundation & Waterproofing Today!

If you are dealing with sinkhole concerns in Chattanooga, Tennessee, our team is ready to help. We provide professional inspection, repair, and remediation services designed to stabilize your property and prevent further damage.