Structural Repairs
Cracks
Water leaking into a block, brick, or stone foundation can cause serious structural damage if left unrepaired. When moisture becomes trapped inside the foundation, it begins to weaken the lime in the concrete, leading to cracking and deterioration. Over time, this can progress into significant structural foundation problems. Prompt and proper repair is essential to protect the integrity of your home.
Structural cracks are any cracks that jeopardize the integrity of a foundation. These typically appear as:
- Buckling, bowing, or bulging within the foundation wall
- Shifting sections of the wall
Where Structural Cracks Occur
- Most common in block, brick, or stone foundations
- Can also occur in solid cement walls
Causes include:
- Hydrostatic pressure
- Soil loads pressing against the wall
- Ground expansion from freeze-thaw cycles
- Moisture intrusion
When these lateral forces exceed the wall’s original resistance, the foundation bends, resulting in bowing and significant cracking. Some bows are subtle and hard to see head-on. To detect a bow, stand at one end of the wall with your head close to the foundation and look down its full length. A laser lever is a useful toll for determining how much a wall is out of plumb.
In many cases, excavating the entire exterior of the affected wall allows it to flex back toward its original position, correcting the bow and preventing further damage
Why Prompt Action Matters
If left untreated, structural cracks:
- Worsen over time
- Compromise the structural integrity of your home
- Reduce resale value
Repair Options
1. Carbon fiber
Bowed Basement Walls – Carbon Fiber Repair
Bowed basement walls can now be effectively stabilized using advanced carbon-fiber technology. At Basement Waterproofing Solutions, we utilize carbon-fiber systems developed by Fortress Stabilization Systems.
How it works:
Carbon-fiber sheet straps are applied to the bowed wall.
- The carbon-fiber straps are anchored to the top framing plate.
- They are also drilled into the basement floor/wall seam, creating a secure attachment that stabilizes the bowed wall.
- Specialized epoxy adhesives are used to bond the straps securely to the foundation.
- The repair is structurally effective yet minimally obtrusive, allowing walls to be painted afterward, creating an almost invisible finish.
Limitations:
- For walls that are significantly out of plumb, carbon fiber may not be sufficient.
- Example: An 8 ft wall that is 1.5 inches out of plumb is beyond the tolerance for a carbon-fiber repair and may require a more extensive solution.
Benefits:
- Reinforces and arrests the bowing
- Non-invasive compared to traditional structural repairs
- Maintains the aesthetic of the basement
2. Steel “I” beam supports
For over 30 years, Basement Waterproofing Solutions has installed steel reinforcement beams against bowing foundation walls to prevent further structural damage. All installations strictly follow engineer-designed plans, tailored to the unique needs of each home.
As industry standards evolved, we adopted the latest carbon-fiber technology for structural foundation crack repairs. Today, we offer custom solutions, combining:
- Steel beam construction for heavy-duty reinforcement
- Carbon-fiber systems for minimally invasive stabilization
Each repair plan is engineered specifically for your foundation’s structural situation, ensuring maximum safety, longevity, and peace of mind.
3. Masonry support buttress
Support Buttresses
A buttress is a structure built against or projecting from a wall to support or reinforce it. Historically, buttresses were commonly used on older buildings to resist lateral (sideways) forces acting on foundation walls.
Modern Use:
- Today, support buttresses are rarely installed.
- They are only used in very unique situations, as modern foundation repair techniques—such as carbon fiber and steel reinforcement systems—offer more effective and less intrusive solutions.
4. Complete or partial wall replacement
Signs your foundation wall needs to be replaced:
- When several blocks have become loose, displaced, or completely pushed in.
- One or Multiple large cracks.
- A bowing wall of 3 inches or more.
Rebar Core filling / Wall Pin Foundation Repair Solutions
Wall pins and Steel I beam combination above.
Rebar core filling or Vertical Wall Pins (for Structurally Failing Walls with Horizontal Cracks)
Best for: Block walls exhibiting horizontal cracking, significant inward bowing, or shearing at the base—typically caused by excessive lateral soil pressure.
How it works:
- ½″ or ⅜″ high-strength steel rebar is inserted vertically into the hollow cores of the block wall.
- 3″ core holes are drilled at the top, center, and (when required) bottom of each pin location.
- If the bottom course is cracked or sheared, a larger 5″–6″ hole is cored through the block so the footing can be drilled and rebar can be embedded 6″–12″ into the footing for maximum stability.
- After the rebar is set, all hollow cores along the pin line are filled solid with high-strength, non-shrink grout or concrete.
- Core holes are patched flush with the wall surface and can be painted to blend seamlessly.
Advantages:
- Virtually invisible when complete
- Restores full structural integrity
Typical spacing: Every 24″ on center (engineered plans may call for tighter spacing in severe cases) Note: Because of the labor and materials required, vertical wall pins are generally higher in cost than carbon fiber or I-beam systems.
6. Carbon Fiber Crack Stitching for Block Foundation Walls
Best for: Common stair-step cracks, vertical cracks, and narrow horizontal cracks in concrete and block walls where the wall remains straight or has only minor deflection.
How it works:
A diamond-blade saw or grinder is used to cut a precise slot approximately 2 inches deep, perpendicular across the crack.
The slot is thoroughly cleaned of dust and debris.
High-strength structural epoxy is applied into the slot.
A rigid, high-tensile carbon fiber stitch (staple) is fully embedded into the epoxy-filled slot, mechanically locking the two sides of the crack together.
Additional epoxy is worked around the stitch and troweled flush with the wall surface for a smooth, paintable finish.
Typical spacing: Stitches are placed every 12–16 inches vertically (or as specified by the structural engineer) to restore tensile strength across the entire cracked area.
Key advantages:
Extremely strong (tensile strength far exceeding steel)
Zero corrosion risk
Virtually invisible once painted
Fast installation with minimal mess
No exterior excavation required
Limitations: Carbon fiber stitching is a crack-repair solution and does not address significant inward bowing or ongoing wall movement. If the wall has deflected more than 1 inch or is actively moving, additional stabilization (push or helical piers, or steel I-beams) is required before stitching.
Carbon fiber crack stitching provides a permanent, high-performance repair that is backed by engineering calculations and transferable warranties when installed by certified professionals.
Ready to eliminate those cracks for good? Schedule your free foundation inspection today.
7. Foundation wall underpinning
Underpinning a foundation is a structural repair method used to strengthen, stabilize, or deepen an existing foundation when it can no longer adequately support a building. Below is a means-and-methods overview, from causes to techniques, risks, and what to expect.
Why underpinning is needed
Common reasons include:
Foundation settlement or movement (uneven sinking, cracking)
Soil issues (expansive clay, erosion, poor compaction, high groundwater)
Increased loads (adding floors, heavier materials, renovations)
Change in soil conditions (nearby excavation, drought, flooding)
Original foundation defects (shallow footings, inadequate design)
Typical warning signs:
Stair-step cracks in masonry
Vertical or diagonal wall cracks
Doors/windows sticking or out of square
Sloping floors
Gaps between walls and ceilings/floors
Common underpinning methods
The best method depends on soil conditions, building type, access, budget, and severity.
Mass concrete underpinning (traditional)
Small sections of soil are excavated beneath the existing footing
Concrete is poured to create a deeper, stronger footing
Done in stages (“pins”) to maintain stability
Pros: Proven, relatively simple
Cons: Labor-intensive, disruptive, not ideal for very poor soils
8. Footings and lally columns
