Foundation Crack Repair After DIY Injection Kit

Why Big-Box Store Crack Repair Kits Often Fail

Homeowners frequently try low-pressure foundation crack repair kits sold at big-box retailers to address basement leaks. While these kits may seem cost-effective upfront, they often fail because they only seal the visible surface of the crack, leaving internal voids unfilled—particularly in cracks that allow water to travel behind the repair.

In the photo above, the crack was repaired using a low-pressure DIY injection kit. The material only adhered to the surface and followed the visible crack line, leaving voids deeper within the foundation wall. As a result, water continued to travel behind the patch, eventually finding its way back into the basement.

This is a common issue we see when:

• The crack extends through the full thickness of the foundation wall

• Water pressure is present behind the wall

• The repair material lacks sufficient pressure to fully penetrate the crack

Professional High-Pressure Crack Injection: The Permanent Solution

As seen below, our team at New England Foundation Crack Repair corrected the failed DIY repair using a professional high-pressure injection system. This process forces industrial-grade polyurethane deep into the crack, where it reacts upon contact with moisture and expands to form a dense, closed-cell foam. As the material fills the entire crack from the interior face to the exterior soil line, you can visibly see it foaming out of the crack and adjacent injection ports, confirming full penetration and a complete seal that low-pressure kits cannot achieve.

What Makes High-Pressure Injection Different?

• Full crack penetration — seals the crack through the entire wall thickness

• Stops active leaks — effective even with ongoing water intrusion

• Permanent results — backed by a lifetime transferable warranty

Before injecting, we removed the current materials, properly prepped the crack, and installed injection ports at calculated intervals. The material was then injected under controlled pressure to ensure complete saturation—something low-pressure kits simply cannot achieve.

DIY vs Professional Foundation Crack Repair

DIY Low-Pressure Crack Repair Kits	NEFCR's Professional High-Pressure Injection
Applied to the surface of the wall	Injected directly into the crack
Material spreads slowly and follows the easiest path	Material is pushed through the entire crack
Often seals only the visible portion of the crack	Seals the crack from the inside out
Results depend heavily on perfect prep and conditions	Results are controlled during the repair process
May require repeat repairs over time	Designed as a permanent solution
Typically no warranty	Includes a lifetime transferable warranty

Why Proper Crack Repair Matters

Foundation cracks are not always just cosmetic. If left improperly repaired, they can lead to:

• Ongoing basement water intrusion

• Mold and moisture damage

• Worsening structural movement

• Reduced home value

Addressing the crack correctly the first time prevents repeat repairs and long-term damage.

Expert Foundation Crack Repair in New England

If you’ve tried a DIY foundation crack repair kit and the leak returned, you’re not alone—and it’s fixable. Our team specializes in correcting failed crack repairs using proven, professional methods designed to last.

If you’re dealing with a leaking or recurring foundation crack, contact our team to discuss a permanent repair backed by a lifetime warranty.