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Polyurethane Crack Injection

Solution for leaking cracks in garages, swimming pools, basements, floor slabs, concrete walls, etc.

proPERLA offers specialised products for polyurethane injections and also provides the end owner with a network of local professional applicators offering services in the UK, Spain and Portugal. Contact us if you need advice or read on to find out more about this technique.

Foundation Crack Repair Polyurethane Injection

Cracks in concrete have been a major challenge in the building industry, but the major issue with cracks in concrete is how porous they can be, giving room for water and air to pass through. While there are different solutions to this issue, polyurethane injection is an effective, affordable option for sealing cracks in concrete.

Polyurethane injection foam, also known as polyurethane crack injection or polyurethane injection grouting, is a waterproofing method with expanding injection techniques with proven effectiveness in different applications.

This crack-sealing method is aimed at sealing cracks and eliminating water leaks from basement foundations, walls, and swimming pools, among others. Unlike most other alternatives, this solution is ideal for wide and small cracks on concrete surfaces.
This piece explains all you need to know about polyurethane crack injection, such as how it works, types, and costs.

How Does Polyurethane Injection Foam Work?

The science behind these injections is easy to understand, the polyurethane is injected into the crack with the leaking water, the polyurethane reacts with the water creating the foam and expands throughout the crack, saturating the pores.

1 Dril The Crack Leaking Area

1. First, drill through both sides of the crack at 45 degrees (if possible) to reach the crack. Clean out as much dust as possible. Install the packers and adjust.

2 Place The Pakers Into The Holes

2. Water is sometimes injected for two main reasons: 1. to clean the crack and widen it as much as possible. 2. to flood the area with water to allow the polyurethane to react chemically.

3 Filling The Holes With Poliurethane With Pressure

3. Start with the injections. It is recommended to start from the bottom and visually inspect that the polyurethane has reached the upper connector, you will also observe that the foam starts to come out of the main crack.

4 Foam Will Be Flow Of The Crack

4. Once the polyurethane has cured, clean the area, remove the connectors and fill the holes with hydraulic and breathable mortar.

Main problems solved with polyurethane injections

Polyurethane injection effectively fixes different concrete cracks, prevents moisture penetration, and protects structures from decaying due to corrosion and water. This technology is best in wet and actively leaking applications.

Types of cracks to fix with polyurethane injection grout include basement, foundation, swimming pool, and wall cracks. Here are some images of where polyurethane injection grouting is applicable.

Applications areas for PU injections.

Again, polyurethane injection foam is ideal for different applications. Here is an explanation of how the sealing method works in common applications:

pu injectios service leaking swimming pool

Swimming pool crack repair

Our applicators are versed in repairing cracked swimming pools with polyurethane injection foam to stop water penetration through the pool walls. Since polyurethane is best known for its effectiveness in wet applications, swimming pools are a good example of where to apply the technology.

Concrete Beam Concrete Slab Crack Repair Polyurethane

Concrete Crack Repair

Polyurethane injection is the best fix for a cracked beam. Injecting polyurethane into a crack beam helps bring it back to its stiffness and strength. The cure also ensures that the area doesn’t crack again.

Concrete Slab Cealing Leaking Crack Injection

Cracked wall repair

Cracked walls are a common structural issue today, but thanks to technology like polyurethane, it is easy to fix cracks in walls. Injecting polyurethane into the walls helps join the cracked parts by expanding into the cracks up to 20 times its original volume.

Foundation Crack Repair Polyurethane Injection

Foundation Crack Repair

One common area of application of polyurethane grout is basement foundation repair. Our specialists will repair your foundation cracks by injecting polyurethane injection into the cracks, preventing moisture movement, and restoring your foundation to its original state.

More application photos of polyurethane injections

Epoxy vs. Polyurethane Injection

When choosing an injection technique for sealing cracked walls or foundation, you are probably left to choose between polyurethane grout injection and epoxy resin injection. Though these two methods are known to seal cracks in concrete and prevent water and air leakage, they are ideal in different applications.
While epoxy resin injection is designed to seal cracks on dry surfaces, polyurethane injection resin is best at sealing cracks in wet, leaking substrates. Hence, your choice depends on the type of crack you are sealing.
In summary, when repairing structural cracks, consider epoxy injection and polyurethane injection foam for wet, leaking cracks, such as in a swimming pool.

Epoxy: Advantages

  • Recommended for structural cracks under tension.
  • Increased tensile strength.
    Better adhesion .
  • Good for structural repairs.
  • Longer cure time, allows filling of the entire crack and possible fissures.
  • Epoxy is available in different viscosities, for use on small cracks and large cracks.

Epoxy: Disadvantages

  • Epoxy is a surface port injection, the ports must be well bonded and there must be no moisture at all.
  • Crack must be sanitised.
  • No water or moisture must be present, not valid for active water leaks.
  • Not valid for re-application of an already repaired crack, because the epoxy will not flow well due to residual material in the crack.
  • The crack must be clearly visible, and the epoxy must be able to fill the crack completely and remain for the required cure time.

Polyurethane: Advantages

  • Recommended for stopping water leaks.
  • Can be applied regardless of the condition of the crack, dirty, actively leaking water, residues of other materials.
  • It does not matter if it is thin or wide.
  • Chemical expansion of polyurethane (up to 5-10 times its size) makes it excellent for filling all crack voids.
  • Can be applied at high pressure to fill fine cracks or when the concrete is saturated with water, to expel water.
  • Very fast curing in the presence of water, ideal for stopping active water leaks.

Polyurethane: Disadvantages

  • Not good tensile strength.

Properla’s Applicators for Polyurethane Crack Injection

At proPERLA, we run an applicator network for property owners looking for a solution to their cracked concrete with polyurethane. When you contact us, we connect you to a professional, quality specialist who will visit to survey your property. Our applicators are available in the UK, Spain, and Portugal.

Contact us today for a specialist to fix your cracked, leaky concrete using polyurethane crack injection.

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Click here to find an approved applicator in UK.

Click here to find an approved applicator in Spain. 

Click here to find an approved applicator in France. 

Click here to find an approved applicator in Germany. 

Click here to find an approved applicator in Portugal. 

FAQ: Polyurethane Injection Grouting

Before choosing polyurethane injection foam for fixing your leaky swimming pool, basement foundation, or wall, you want to know if it has adverse health effects, hence the question of whether polyurethane resin is toxic. The answer to the question is it depends. While the toxicity of polyurethane depends on the type, it also depends on the applicator.

It is worth noting that some resins contain volatile organic compounds which are gas-like. When emitted due to improper application, these chemicals can cause irritation with some forms of respiratory issues.

However, with the right choice of polyurethane injection foam and the right applicator, polyurethane injection is safe to use in both commercial and residential applications.

At Properla, our applicators understand this and ensure the application causes no adverse effects to the environment.

How much polyurethane crack injection costs depends on different factors. For example, while the crack size is a significant cost determinant, the site’s location also plays a role in what to budget for the injection.

Hence, it is best to contact a specialist like our applicators to know how much it will cost to apply polyurethane crack injection.

At Properla, our applicators are always available to give you an estimate of how much it will cost to seal your cracked concrete with polyurethane injection foam.

Conclusion on injections and leakage repairs​.

Polyurethane is an effective method for sealing cracks in walls, basements, foundations and swimming pools with water leaks, whether active or damp. Epoxy is a good method for crack repairs in dry concrete where structural repair is required.

At proPERLA®, our applicator program matches our customers with professional, quality specialists to seal cracks using polyurethane. Our applicator network is available in the UK, Spain and Portugal.