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PU Grouting & PU Injection

At Adcos International, our portfolio offers a comprehensive range of specialised chemicals to combat water ingress and structure leakage repairs, including polyurethane (PU) grout.

Polyurethane grout is a versatile construction material used to seal joints in concrete, screed, or masonry, as well as water-bearing cracks. It is composed of a two-component system: a polyol component and an isocyanate component, which are mixed together just before use.

What You Need To Know About PU Grouting & PU Injection

Polyurethane (PU) grouting is a specialised technique involving the injection of expanding polyurethane to prevent moisture from seeping through cracks or to fill voids under slabs or behind concrete walls and joints.

The PU grout is injected into a pre-drilled hole to fill voids, seal leaks, and strengthen the surrounding substrate. Subsequently, the grout will expand to fill any crevices that are caused by water damage. This PU injection method is commonly used for concrete cracks or expansion joints that are actively leaking.

Why Polyurethane Resin Is Ideal For Combating Concrete Leaks

The suitability of polyurethane resin as a waterproofing method stems from its inherent properties. Its low viscosity allows it to comfortably seal tiny cracks after curing on moisture.

Additionally, the resin has a short curing time, undergoing a chemical transformation from liquid to solid within minutes when injected into concrete during a leak repair.

The polyurethane resin also retains its flexibility upon curing, allowing for subsequent movement in the structure while ensuring the voids remain sealed, thus preventing water ingress from occurring.

The Precision Process of PU Grouting

A pre-drilled hole is first prepared on the underside of the ceiling to allow the polyurethane resin to be injected into the affected area using a pressure machine. This pressure will cause the resin to ascend into any crevices or voids caused by water damage, filling them up as it expands.

Applications of PU Injection

Concrete Repair & Rehabilitation

  • Curtain injections behind concrete and masonry structures

Leak Sealing & Waterproofing

  • Leak sealing of tunnel segments and joints
  • Leak sealing of diaphragm wall, sheet pile and bore piles
  • Leak sealing of cracks, joints and porous concrete structures
  • Leak sealing of potable water and chemicals retaining structures

Residential Leakages

Our team of certified and highly skilled workers have more than 30 years of experience in leak sealing and concrete repair solutions. Let us help you alleviate your worries and stress from these problematic water leakage issues with our tried-and-tested, effective and durable solutions.

We can help you fix problematic water leakage issues in your Estate, including:

  • Underground Structure — basement carparks, garages
  • Wet Areas — toilets, kitchens, window frames, terraces, gardens, planters, bedrooms walls, ceilings
  • Water Retaining Structure — swimming pool, water tanks
  • Roof — concrete, tile, or metal roof

As long as there's a water leak, you can count on us to have it fixed.

What Are The Common Causes Of Building Cracks

1. Poor Drainage

Excess dampness is the primary cause of building cracks, with an inadequate drainage system often causing water seepages that lead to the creation of holes and wear and tear on the concrete and other building materials over time.

2. Heavy Load

Heavy loads generated from the constant movement of machinery and vehicles, including forklifts, trucks, and lorries, can damage a building’s structure over a prolonged period of time. In particular, areas with high traffic volume often experience the most severe cracks.

3. Wear and Tear

As time passes, a building will experience wear and tear from the elements. Without adequate maintenance, especially in crucial areas like the roofs and wet areas prone to moisture, cracks will eventually surface, weakening the structure.

Top Benefits Of PU Injection For Waterproofing

PU injection is often used for leak repairs as it holds distinct advantages over other waterproofing methods. Due to its close-cell nature,  flexibility and durability, polyurethane can effectively safeguard against membrane cracks and building movements that compromise waterproofing effectiveness.

Polyurethane’s elastic nature also means the resin is resistant to thermal expansion and deterioration from extended exposure to sunlight, making it one of the most suitable methods for application on surfaces exposed to the elements, like the roof.

Furthermore, it is a relatively hassle-free and low-cost solution compared to other methods, which often involve heavy hacking. Lastly, it requires little to almost no further maintenance upon successful application.

These benefits, along with its fast-drying property and ability to seal tiny hairline cracks that are otherwise challenging to spot, make it clear why PU grouting is the go-to waterproofing method.

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