PU Grouting Singapore – How Does It Work & Reasons To Do It

In the ever-evolving world of construction and waterproofing, innovative techniques have emerged to tackle common problems like water leakage, foundation settlement, and structural damage. One such method that has gained popularity in Singapore is PU grouting, short for Polyurethane Grouting. This article provides a detailed insight into PU grouting from a waterproofing industry perspective, explaining its significance, the numerous benefits it offers, how it works, tips for successful implementation, and the tools utilized in PU grouting.

What is PU Grouting from a Waterproofing Industry Perspective?

PU grouting, or Polyurethane Grouting, is a specialized technique used in the field of waterproofing, construction, and civil engineering. It involves the injection of polyurethane resin into voids or cracks in structures, ensuring waterproofing and the stabilization of foundations. PU grouting is a versatile and effective solution that addresses several common issues, making it a preferred choice for various projects in Singapore.

Benefits of Getting PU Grouting in Singapore

Waterproofing and Sealing:

PU grouting creates a watertight barrier, preventing water infiltration into structures. It’s highly effective for sealing leaks in basements, underground parking lots, and other areas prone to water ingress.

Strengthening Foundations:

This technique stabilizes the foundation by filling voids and compacting the soil beneath. It’s particularly valuable in areas with soil settlement issues or where construction vibrations have caused structural damage.

Minimally Invasive:

PU grouting is non-disruptive and minimally invasive. It does not require extensive excavation, making it an excellent choice for areas with limited access.

Quick and Cost-Effective:

PU grouting is a relatively quick process, minimizing downtime for businesses or homeowners. It also saves on costs associated with traditional repair methods, which can be time-consuming and labor-intensive.


The polyurethane material is highly durable and long-lasting. It can withstand environmental factors, ensuring the longevity of the repaired structure.

Environmental Friendliness:

PU grouting is an eco-friendly choice, as it minimizes the need for replacing materials and reduces waste generation.

How Does PU Grouting Work?

The process of PU grouting involves several steps:

Site Inspection:

The first step is to thoroughly assess the site, identifying the extent of the damage and the locations where PU grouting is required.

Drilling Holes:

Small holes are drilled into the affected area to allow access for the polyurethane injection. The location and size of these holes are determined by the specific requirements of the project.

Injection of Polyurethane Resin:

A specialized grouting pump is used to inject the polyurethane resin into the drilled holes. The resin then expands to fill voids and cracks, effectively sealing and stabilizing the area.

Monitoring and Testing:

Technicians continuously monitor the injection process to ensure that the voids are being filled properly. Pressure and flow rates are adjusted as necessary.

Clean-up and Restoration:

After the grouting is completed, the drilled holes are sealed, and the site is cleaned up, leaving minimal evidence of the repair work.

Tips for Successful PU Grouting

Professional Assessment:

Always begin with a thorough inspection and assessment by a qualified waterproofing specialist to determine the extent of the issue and the specific requirements for PU grouting.

Quality Materials:

Ensure that high-quality polyurethane resin is used, as the effectiveness and durability of the grouting largely depend on the material.

Experienced Technicians:

Hire experienced professionals who are skilled in PU grouting techniques to ensure the work is done correctly.

Accurate Drilling:

Precise drilling is essential to reach the affected areas without causing further damage to the structure.

Proper Monitoring:

Continuous monitoring of the injection process is crucial to achieve uniform and effective grouting.

Tools Used in PU Grouting

Grouting Pump:

This specialized pump is used to inject the polyurethane resin into the drilled holes. It controls the pressure and flow rates to ensure accurate PU grouting.

Drilling Equipment:

Tools for drilling holes into the structure, typically including a rotary hammer or diamond core drill.

Safety Gear:

Personal protective equipment such as gloves, safety goggles, and hard hats to ensure the safety of the technicians.

Polyurethane Resin:

High-quality polyurethane resin that expands to fill voids and cracks, creating a waterproof seal.

Sealant and Plugs:

Materials for sealing the drilled holes and restoring the site to its original condition.


PU grouting in Singapore is a versatile and efficient solution in the field of waterproofing and structural repair. Its benefits, such as waterproofing, foundation stabilization, minimal invasiveness, and cost-effectiveness, make it a preferred choice for a wide range of projects. When considering PU grouting, it’s crucial to work with experienced professionals who use high-quality materials and tools, ensuring a successful and durable repair that safeguards your structure from water ingress and structural issues.