Waterproofing Solution for a Concrete Basement Car Park
In construction projects, effectively managing water ingress is crucial for maintaining structural integrity. This project in London involved Total Specialist Maintenance (TSM) collaborating with a construction contractor to address significant water ingress issues in a newly constructed concrete basement car park.
The Challenge
The client had constructed a new concrete basement car park that was experiencing water ingress through the movement joint between the old and new buildings. This situation posed several risks:
- Structural Integrity: The ongoing water ingress threatened the durability of the concrete structure, potentially leading to long-term damage.
- Urgent Remediation Needed: Immediate action was necessary to prevent further damage and ensure the longevity of the car park, as continued exposure to moisture could compromise safety.
The Solution
TSM implemented a comprehensive waterproofing strategy that included several critical steps:
- Exposing the Joint: TSM began by accessing the joint between the old and new buildings to assess the extent of the water ingress issue. This initial evaluation was crucial for determining the necessary repairs.
- Removing Fibre Board: The team extracted the fibre board within the joint to its full depth. This preparation step ensured that the joint was clean and ready for the waterproofing process.
- Temporary Plugging: To prevent the resin injection material from escaping during the repair process, TSM used a fast-setting R4 concrete repair mortar to temporarily plug the joint. This step was essential for maintaining the integrity of the repair.
- Installing Injection Packers: TSM fitted injection no-return valve packers to facilitate effective application of the resin. This ensured that the waterproofing material would penetrate the joint thoroughly and seal any gaps.
- Applying Elastomer Gel Injection System: Utilising the MC Injekt GL 95 TX thixotropic elastomer gel injection system, TSM sealed the joint thoroughly. This high-performance gel provided a flexible, durable seal against water ingress.
- Removing Packers: After the injection process, the injection packers were removed, and temporary plugging mortar was applied to restore the surface integrity.
- Creating a Recess: TSM broke out a 250mm recess within the concrete slab to accommodate the final waterproofing detail. This step was necessary for ensuring effective waterproofing coverage.
- Fitting Waterproofing Membrane: To enhance protection, TSM installed Sika Combiflex (200mm wide x 2mm thick) to the waterproofed joint. This membrane provided an additional barrier against moisture.
- Applying Epoxy Repair Mortar: Finally, the recessed joint was covered with an epoxy repair mortar to protect it from foot and vehicle traffic, ensuring long-term durability.
Project Management Excellence
TSM’s project management team ensured that all aspects of the waterproofing strategy were executed efficiently and effectively. By closely coordinating with the construction contractor, TSM minimised disruptions to ongoing activities and maintained clear communication throughout the project.
Quality Assurance and Safety
Safety and quality assurance were top priorities throughout the project. TSM adhered to strict quality control protocols to ensure that all work met industry standards and client specifications. The team implemented safety guidelines to protect workers and ensure the integrity of the construction site.
Environmental Considerations
The materials used in the waterproofing and repair processes were environmentally friendly, posing no risks to the surrounding environment. TSM’s commitment to sustainable practices ensured that the project adhered to best practices for environmental safety.
