What is Considered as a Major Crack?

Vertical Cracks (Often Due to Settling)

Vertical cracks are among the most common foundation cracks. These cracks run up and down and are usually caused by natural settling. While they don’t always indicate foundation issues, if they grow wider than 1/8 inch or start to leak water, they may need foundation crack repair.

Diagonal Cracks (Potential Structural Concern)

Diagonal cracks appear at an angle and can indicate differential settlement—when one part of the basement foundation settles faster than another. If these cracks grow or cause parts of the foundation to shift, they can become structural foundation cracks requiring an effective solution.

Stair-Step Cracks (Sign of Structural Movement)

Stair-step cracks are common in brick and block foundations, following the mortar joints. These cracks are often a sign of foundation issues and should be inspected, especially if they widen over time. Carbon fiber reinforcement or foundation crack repair may be needed to prevent further movement.

Horizontal Cracks (A Major Warning Sign)

Among all types of cracks, horizontal cracks are the most serious. They typically result from excessive water pressure against the foundation walls, causing them to bow inward. These cracks are a sign of serious structural issues and need immediate reinforcement to prevent foundation failure.

What is Considered as a Major Crack?

A major crack is one that compromises the structural integrity of the foundation. Cracks wider than 1/8 inch, expanding over time, or causing displacement of the foundation are considered structural foundation cracks. Other warning signs of major cracks include:

• Water intrusion through cracks, leading to moisture problems

• Walls bowing due to soil pressure

• Gaps forming between walls and floors

• Uneven floors indicating foundation movement

If you notice these signs, consulting a professional for foundation crack repair is crucial to prevent further damage.

Preventing Structural Foundation Cracks

Homeowners can take steps to prevent foundation cracks before they become serious problems. Some ways to protect your foundation include:

• Managing Excessive Water – Poor drainage and clogged gutters can cause hydrostatic pressure, leading to major cracks.

• Soil Stabilization – Ensuring proper soil conditions around the foundation helps reduce settlement-related cracks.

• Reinforcement Solutions – Carbon fiber straps and wall anchors help prevent bowing walls and horizontal cracks.

Repairing Structural Foundation Cracks

The repair cost depends on the severity and type of crack. Solutions for foundation crack repair include:

• Epoxy or Polyurethane Injection – Seals small cracks and prevents water leaks.

• Carbon Fiber Reinforcement – Strengthens walls and prevents further movement.

• Wall Anchors or Bracing – Provides structural support for foundation walls affected by hydrostatic pressure.

When to Call a Professional

If you’re unsure what is considered as a major crack, a foundation expert can assess the damage. Serious structural foundation cracks require immediate attention to avoid costly repairs. Identifying foundation issues early and seeking the right effective solution ensures your home remains safe and stable.