Chicagoland Masonry & Concrete
Foundation Crack Repair in Chicagoland
Foundation cracks that admit water cause interior moisture damage, mold, and structural deterioration. We seal them from the exterior and interior using proven repair systems.
Foundation Cracks Don't Heal Themselves
Chicagoland's clay soils, particularly in the DuPage County communities of Wheaton, Glen Ellyn, Downers Grove, and Naperville, exert constant lateral pressure on foundation walls. Seasonal moisture changes cause the clay to swell and contract, and the resulting movement generates cracks in poured concrete foundations and in block and brick foundation walls. Water entry through foundation cracks causes interior moisture damage, efflorescence on interior walls, mold growth, and in severe cases, structural compromise. The correct repair approach depends on crack type, width, activity, and whether water is actively entering.
Active Water Infiltration
Water entering through foundation cracks causes interior damage quickly. Visible water entry requires prompt repair before the next rain event.
Hairline & Shrinkage Cracks
Normal concrete shrinkage cracks are typically not structural concerns but allow water entry that causes interior moisture and mold issues.
Horizontal & Diagonal Cracks
Horizontal cracks in block or poured concrete walls indicate lateral soil pressure, potentially structural, and require professional evaluation.
Stair-Step Cracks in Block Walls
Diagonal stair-step cracking through block mortar joints indicates differential settlement or lateral pressure and requires repair and evaluation.
Efflorescence & Staining
White mineral deposits and water staining on interior foundation surfaces indicate active water movement through the foundation material.
What We Do & How We Do It
Epoxy Crack Injection
Structural cracks in poured concrete foundations are repaired using two-component epoxy injection, injected under low pressure through surface ports to fill the full depth of the crack and restore structural integrity.
Polyurethane Foam Injection
Active water-leaking cracks are typically addressed with polyurethane foam injection, which expands on contact with moisture and creates a flexible, waterproof seal.
Cementitious Crack Patching
Surface preparation, crack routing, and crystalline cementitious repair materials are used for surface and non-structural crack repair in block and masonry foundation walls.
Exterior Waterproofing Repair
Where excavation is warranted, we apply exterior dampproofing and waterproofing membranes, install drainage board, and address exterior water management at the grade level.
Tar Membrane Repairs
We repair failed or peeling tar-based dampproofing membranes where exposed at grade or during excavation, addressing the most common exterior moisture management failure point.
Early Repair vs. Major Excavation Later
Interior epoxy injection and polyurethane crack sealing costs a fraction of full exterior excavation and waterproofing membrane installation. The right repair approach depends on crack type and severity, but the window for the least expensive repair is always now, not after another wet season of water infiltration has expanded the crack, damaged interior finishes, and introduced mold to the wall assembly. Homeowners in Hinsdale, Burr Ridge, and Oak Brook who address foundation cracks promptly avoid far more expensive remediation projects.
Why Chicagoland Masonry & Concrete
With over 50 years of combined experience, we have been repairing and restoring masonry and concrete across Chicagoland. We do not sub out work, we do not cut corners on mortar specification, and we do not recommend more than what your project actually needs.
Get a Free EstimateServing Chicagoland homeowners with 50+ years combined experience
Crew-owner involvement on every project, no subcontractors
Detailed written estimates with clear scope and pricing
All work warrantied against defects in materials and workmanship
Fully licensed, bonded, and insured in Illinois
We work with historic brick and non-standard mortar mixes
Serving Chicagoland's Premier Communities
We serve homeowners and property managers throughout the Chicago metropolitan area.
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Ready to Get Started?
Call us or submit a project request online. We provide written estimates with clear scope and pricing across all of Chicagoland.