PU Grouting & PU Injection

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PU Grouting Injection


PU Grouting Injection is a common method used in the industry to stop the water leakage. PU stands for polyurethane which has the hydrophobic characteristic. It is widely used to repairs the cracks in concretes and honey-combed concrete by pressuring the chemical into the defect areas. When the PU (polyurethane) expose to the water, the chemical reacts and expands becomes foams to seal the concrete pores and cracks. The expansion of the PU can up to 20 times of it volume injected.

PU Grouting Injection is no doubt the most effective leaking crack repair method in concrete. The widespread use of polyurethane for concrete crack injection is a tribute to the inherent versatility of low viscosity polyurethane injection resins for leak sealing applications. It is commonly used in civil, commercial and residential applications.


Properties of PU (Polyurethane)


Polyurethane is a fluid resin which is injected into concrete cracks, rock fissures, expansion joints and other voids in concrete structures. When used in concrete crack injection applications the polyurethane is injected into a crack; within minutes the polyurethane undergoes a chemical transformation from a liquid to a solid.

The versatility, and consequently the popularity, of polyurethane resins in crack injection applications stems from polyurethane’s properties:


 It has a very short cure time, making it ideal for active leak sealing.

 Extremely low viscosity allowing for even the finest fishers (cracks with a width less than 0.2mm) to be sealed.

 The resin cures normally whether a foundation crack is wet, actively leaking, or damp.

 There are literally thousands of polyurethane resin formulations which is useful when repairing foundation cracks because the viscosity of the resin and cure time can be controlled.

 Polyurethane, once cured, can be quite flexible, allowing for movement in the structure and leak leaks to remain sealed.

 Any leak in a concrete structure can be sealed.


PU grouting injection is used in Civil Construction and maintenance of Civil Assets due to its flexibility in application and its reliability in repairing cracks and damage in concrete structures. It is the most efficient and cost effective method in repairing leaking cracks in major concrete assets.


Applications include:


Civil Water – treatment plants, town water supply, pump stations, channels, canals

Sewage Treatment Plants – high voltage electrical pits, man holes, chemical storage areas

Dams – diversion tunnels, dam walls, permanent plugs, dam walls, weirs

Tunnels – rail, road, access and electrical

Underground Structures


PU Grouting Contractor Singapore


How we can help you? We have a team of professional which more than 10 years of in PU Grouting Injection.

1. Inspections

Once we received your enquiry, We will arrange a team to visit your site for inspection. Not all water leakage issues can solve through PU injection. Our Team will give you the advise base on the situation that you are facing.

2. Indentify Causes

After the diagnose session, we will propose you the PU Grouting solutions. In the event that the PU Grouting Solutions is not feasible, we would propose others treatment to rectify the leakage.

3. PU Grouting Injections

Performing the PU Grouting Injections with warranty given.

4. Monitor

Once the PU Grouting Injection is done, the owner shall monitor the repair over the times. If there is a need, our team will re-visit the site for inspections.

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