Slab foundations are a popular choice for many homes due to their affordability and durability. However, over time, these foundations can develop cracks that may compromise the structural integrity of a home. Understanding the causes of these cracks and knowing how to address them can save homeowners from costly repairs down the road. DuraTech Texas would like to explore the common causes of cracks in slab foundations and the best methods to fix them.

Common Causes of Cracks in Slab Foundations

Soil Movement: One of the leading causes of slab foundation cracks is soil movement. Expansive soils, such as clay, can swell when wet and shrink when dry, leading to shifting or uneven pressure on the foundation. This movement creates stress that can result in cracks.
Poor Drainage: Improper drainage around a property can eventually cause water to pool around the foundation. Excess moisture can weaken the soil supporting the slab, causing it to settle unevenly and crack.
Temperature Changes: Extreme temperature changes can cause the concrete in a slab foundation to expand and contract. Over time, this repeated stress can lead to cracks, particularly in poorly constructed foundations.
Tree Roots: Nearby trees and large plants can cause foundation cracks. Their roots may grow beneath the slab, exerting pressure on the foundation or drawing moisture from the soil, leading to settling and cracking.
Settling or Poor Construction: If a foundation is built on poorly compacted soil or without proper reinforcement, it may settle unevenly over time. This settling often results in cracks, especially in areas of weak support.
Heavy Loads: Slab foundations are designed to bear a certain load. Excessive weight from heavy machinery, large furniture, or structural additions can place undue stress on the slab, causing it to crack.

How to Fix Cracks in Slab Foundations

Once you have identified cracks in your slab foundation, it’s important to address them promptly to prevent further damage. Here are some common repair methods:
Epoxy or Polyurethane Injection: For small, non-structural cracks, epoxy or polyurethane injections can seal the crack and prevent water infiltration. These materials bond with the concrete, restoring its integrity and preventing further damage.
Slab Jacking (Mudjacking): Slab jacking is a common technique used to lift and stabilize uneven foundations. This involves injecting a mixture of cement, sand, and other materials beneath the slab to fill voids and restore the foundation’s level.
Steel Piering: For major cracks caused by settling, steel piering can provide a long-term solution. Steel piers are driven deep into stable soil beneath the foundation, offering solid support and preventing further movement.
Installing Root Barriers: If tree roots are the culprit, installing root barriers can help prevent further intrusion. These barriers block roots from growing beneath the foundation while preserving the health of the tree.
Reinforcing the Slab: For foundations with widespread cracking, reinforcing the slab with rebar or carbon fiber may be necessary. This adds strength to the concrete and helps prevent further damage.

Foundation Inspection & Repair Services in Crosby, Cypress, Friendswood & Greater Houston, Texas

Cracks in slab foundations are a common issue that can arise due to various factors, including soil movement, drainage problems, and temperature changes. Luckily, most cracks can be repaired effectively with the right approach. For help repairing your home’s foundation, contact DuraTech Texas today.