Wall Crack Repair In Ottawa

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Introduction

Cracks in foundation walls are more than just cosmetic concerns—they can signal deeper structural problems. With its extreme winters and freeze-thaw cycles, Ottawa’s climate puts unique pressure on foundations. If left untreated, wall cracks can lead to:

• Water Infiltration: Allowing water to enter the basement or foundation.
• Structural Instability: Compromising the safety and durability of the entire structure.
• Increased Repair Costs: Delaying repairs can lead to more extensive and expensive issues.

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Why Wall Cracks Occur

Understanding the root causes of wall cracks is crucial for effective repairs. Common causes include:

• Freeze-Thaw Cycles:
  • Soil Expansion and Contraction: Ottawa’s cold winters cause soil to freeze and expand, creating pressure on foundation walls.
  • Thawing Stress: When the soil thaws, it contracts, leading to movement and potential cracking.
• Hydrostatic Pressure:
  • Water Buildup: Water accumulation in the soil creates pressure against the walls, particularly during heavy rain or melting snow.
  • Poor Drainage: Inadequate drainage systems allow water to pool around the foundation, increasing hydrostatic pressure.
• Foundation Settling:
  • Uneven Settling: Over time, the foundation settles into the soil, which may lead to cracks as the weight is distributed unevenly.
  • Compaction Issues: If the soil beneath the foundation wasn’t properly compacted during construction, settling can cause significant damage.
• Soil Conditions:
  • Expansive Soils: Soils swell when wet and shrink when dry, placing stress on foundation walls and causing cracks.
  • Soil Erosion: The loss of supporting soil due to poor drainage or landscaping can destabilize the foundation.
• Structural Shifting:
  • Nearby Construction: Vibrations from heavy machinery can cause foundation walls to shift and crack.
  • Seismic Activity: Even minor seismic events can stress foundations and cause cracks in the walls.

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Types of Wall Cracks

Different types of cracks may indicate various levels of concern. Here are the most common types of wall cracks:

• Vertical Cracks:
  • Causes: Often due to minor settling or shrinking of concrete after construction.
  • Severity: Generally less serious but should still be monitored and repaired.
• Horizontal Cracks:
  • Causes: Typically caused by hydrostatic pressure or soil movement.
  • Severity: More severe and indicative of significant structural pressure against the foundation wall.
• Diagonal Cracks:
  • Causes: Caused by uneven settling or shifting in the foundation.
  • Severity: This can indicate that one side of the foundation is sinking or moving more than the other.
• Stair-Step Cracks:
  • Causes: Commonly seen in brick or block walls, these are a sign of differential settling or structural movement.
  • Severity: This should be addressed promptly to avoid further damage to the foundation.

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Our Wall Crack Repair Process

Inspection

Thorough Examination: We conduct a detailed inspection of the foundation walls to identify the cracks’ type, size, and cause.

Moisture Assessment: We check for signs of water infiltration and assess waterproofing needs.

Crack Cleaning

Debris Removal: Cleaning out dirt, debris, and old repair materials to prepare the crack for sealing.

Surface Preparation: Ensuring the surface is clean and dry to allow proper bonding of the repair material.

Sealing

Epoxy Injection: We use epoxy injections to bond the walls and prevent water ingress for structural cracks.

Polyurethane Injection: Polyurethane is injected to seal the cracks and provide flexibility for non-structural cracks.

Reinforcement

Carbon Fiber Strips: Reinforcing the wall with carbon fibre strips adds strength and prevents future cracks.

Steel Bars: In more severe cases, steel bars may be installed to provide additional support.

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Signs You Need Wall Crack Repair

It’s essential to address wall cracks early before they worsen. Common signs you need professional repair include:

• Visible Cracks:
  • Cracks in foundation walls that are growing in width or length over time.
• Water Leaks:
  • Moisture or water stains along wall cracks indicate potential water infiltration.
• Bowing or Bulging Walls:
  • Walls bowing or bulging inward due to pressure from the soil or hydrostatic forces.
• Stuck Doors and Windows:
  • Difficulty opening or closing doors and windows can indicate foundation movement that needs immediate attention.