Polyurethane Injection Grouting Waterproofing Solutions
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At Adcos asia, we provide a comprehensive range of specialised chemicals designed to tackle water ingress and structural leakage repairs, including polyurethane injection grouting.
Polyurethane injection grouting is a highly versatile material used to seal cracks in concrete, masonry, and screed, particularly in areas subject to water penetration. This two-component system—consisting of a polyol and isocyanate component—reacts to form a durable, expanding sealant. This system ensures that water is blocked from entering cracks and joints, providing an effective and long-lasting solution for structural waterproofing.
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.
How Does PU Grouting / Injection Repair Services Work?
Polyurethane injection grouting works by injecting a resin into pre-drilled holes in affected areas. The injected polyurethane resin expands and fills cracks and voids, hardening into a water-resistant mass. This process can be used to treat everything from minor cracks to larger structural issues, effectively sealing water leaks and restoring the strength of the affected area.
Understanding the PU Injection Grouting Process
Step 1: Site Assessment
Before commencing injection, a thorough site assessment is conducted to identify the cracks and leaks that need to be sealed.
Step 2: Drilling and Injection
Holes are drilled at strategic points where the cracks are located. The polyurethane resin is then injected under pressure into the affected areas.
Step 3: Expansion and Sealing
Once injected, the polyurethane expands to fill cracks, voids, and joints, creating a water-tight seal. The material then hardens, providing long-lasting protection against water ingress.
Step 4: Curing and Final Inspection
The injected polyurethane resin cures and solidifies, completing the sealing process. A final inspection ensures that all cracks are fully sealed and the area is protected.
Applications of PU Injection Grouting Services
Concrete Repair & Rehabilitation
Curtain injections behind concrete and masonry structures.
Residential Leakages
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 Adcos Asia to have it fixed.
What Are The Common Causes Of Building Cracks
1. Poor Drainage
Inadequate drainage systems often lead to water seepage, which can weaken concrete and other building materials over time, causing cracks to form.
2. Heavy Loads
Heavy machinery or vehicle traffic can damage structures, particularly in areas subjected to constant stress, leading to cracks in walls and floors.
3. Wear and Tear
Over time, exposure to the elements causes natural wear and tear on buildings, particularly in high-moisture areas. Without regular maintenance, this can result in cracks and structural weakness.
Epoxy Resin Injection
Epoxy resin injections are used for their superior bonding capabilities and resistance to water and chemicals. These systems are ideal for repairing structural damage in tunnels where high durability is required.
By using PU injection grouting services, these cracks can be effectively sealed, restoring the building’s integrity and waterproofing.
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.
hese 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.
FAQs
What is PU grouting?
PU grouting involves the injection of polyurethane resin into cracks or voids in structures to seal and waterproof them. This method is commonly used in construction to prevent water infiltration and to stabilise structures, such as basements, tunnels, and foundations.
How long can a PU injection last?
A PU injection can last for many years, often up to 20 years or more, depending on the application, environmental conditions, and quality of the installation. Regular inspections can help maintain its effectiveness over time.
How does PU injection work?
PU injection works by injecting liquid polyurethane resin into cracks or voids. The resin reacts with moisture and expands to fill the space, forming a flexible, watertight seal that prevents further water ingress and stabilises the structure.
Can you polyurethane grout?
Yes, polyurethane can be used as a grout, especially in situations where flexibility, waterproofing, and chemical resistance are needed. It is particularly effective in areas prone to movement or where traditional grout might crack.
How long does polyurethane grout need to cure?
Polyurethane grout typically needs about 24 to 48 hours to fully cure, though this can vary depending on the specific product and environmental conditions. Proper curing ensures maximum strength and durability.