Important Facts About Polyurethane Crack Injection

    Important Facts About Polyurethane Crack Injection

    From the Concrete Crack Repair Pros blog — plain answers from the crews who fix this every day.

    Despite its popularity, polyurethane crack injection is by far the most popular method for repairing cracks that cause water leaks. Due to its inherent versatility, crack injection makes it a leading waterproofing application for both residential and commercial purposes. Structures are protected against corrosion and water-related decay by polyurethane injection, which seals active leaks and prevents moisture migration.

    Cost-effective

    Concrete crack injection of a residential foundation crack cost one-third compared with exterior waterproofing and required no excavation. This effective pressurized injection is capable of filling the crack through the entire thickness of the foundation wall and keeping water outside the building envelope.

    How does it work? Polyurethane injection is a method of repairing cracks; it works by injecting a foam rubber seal into the cracks. When injected this fluid resin into concrete cracks, expansion joints, rock fissures, and other voids in solid underground structures, this undergoes a chemical transformation from a liquid to a solid within minutes.

    Immediate solution

    Polyurethane is ideal for urgent waterproofing because of its very short cure time even if the foundation crack is wet, actively leaking, or dry. Polyurethane‘s viscosity and cure time can be controlled and once cured, can be quite flexible depending on the formulation. It is also a very reliable crack repair when done properly.

    Why you still need a skilled waterproofing contractor

    While the process of polyurethane crack injection is simple in principle, the skill and aptitude of a professional play a vital part in successfully performing a polyurethane crack injection. Our professionals from Concrete Crack Repair have a comprehensive understanding of the right conditions in order to successfully inject a crack. Furthermore, a substantial amount of determination and attention to detail is required for a better outcome.

    Polyurethane Crack Injection versus Epoxy Crack Injection While these two substances are suitable for different industries, their main difference is that epoxy flooring in general is harder whereas PU is more flexible. It is our opinion that many basement crack repair companies promote polyurethane crack injection repair over epoxy which begs the question of whether they offer only polyurethane injection service. At Concrete Crack Repair, we offer both epoxy and polyurethane crack injections to ensure full concrete crack injection to fill the crack, from front to back. We provide our clients with concrete crack injection solutions based on their requirements at an affordable price.

    You can turn your home into a charming and valuable asset with our custom-designed concrete crack injection solutions at a reasonable price.

    Dealing with this in your own basement?

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    Polyurethane Injection FAQ

    What is polyurethane crack injection resin actually made of?
    It is a two-part hydrophobic polyurethane that reacts on contact with water and expands into a closed-cell foam. That reaction is the whole point: the resin chases the water back through the crack rather than being stopped by it, then cures into a flexible seal bonded to both faces of the concrete.
    Does the crack have to be dry before polyurethane injection?
    No — the opposite. Water is the catalyst. Polyurethane is the correct choice precisely when a crack is wet or actively running, which is why we do not ask you to wait for a dry spell. Epoxy is the material that needs a dry, stable crack.
    How long does a polyurethane injection take from start to finish?
    Most single-crack residential jobs run one to three hours on site: surface prep, drilling and setting ports, injecting to refusal, then trimming the ports once the foam has set. You can normally use the room the same day.
    Will injection damage a finished basement wall?
    Ports are set on the interior face of the foundation, so drywall, framing or insulation covering the crack has to be opened up to reach it. We cut the smallest access we can and tell you the size before we start — it is one of the few parts of the job that is genuinely disruptive, and you should hear about it in the quote, not on the day.
    Does cured polyurethane foam smell or off-gas afterwards?
    There is a resin odour during injection that clears within a few hours of ventilation. Once cured the foam is inert — it is the same class of material used to seal water infiltration in tunnels and municipal structures.

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