We supplied material for sealing leaks occurring at the junction of the foundation slab with the foundation wall of the garage. The repair was performed through pressure injection of HYDROFOAM resin.
We describe the entire repair process step by step:
Surface preparation before pressure injection
The process begins with a thorough assessment of the leak location to identify its course, depth, and potential branches. Next, surface cleaning is performed, which includes removing all contaminants — dust, grease, concrete residue, loose plaster fragments, or paint. A clean surface ensures better adhesion of injection materials and eliminates the risk of their detachment.
Preparation of injection holes before pressure injection
The process begins with marking a grid of injection holes along the crack or leak location. Holes are typically spaced 20 to 50 cm apart, depending on the type of structure, crack depth, and injection material used. Their arrangement aims to ensure uniform distribution of resin throughout the entire leak volume.
Next, drilling of holes is performed — typically at a 45° angle to the surface, so that the hole tip is positioned as close as possible to the crack. Drilling depth is selected individually, most commonly in the range of 5–10 cm, depending on the thickness of the structural element.
After drilling the holes, their interior is cleaned of dust and concrete debris — most commonly with compressed air or special brushes. This stage is extremely important because contaminants can hinder resin penetration and weaken its adhesion to the concrete structure.
The next step is installation of injection packers — special valves through which the sealing material will be injected. They must be securely fastened to withstand the pressure of the injected resin.
Finally, before the actual injection, a packer tightness test is performed and hole patency is checked. Only properly prepared holes guarantee effective crack filling and permanent structural sealing.
Pressure pump preparation
The first step is preparing the injection pump – a device that injects resin under appropriate pressure into the structure interior. The pump must be technically sound, tight, and clean. Before use, it should be flushed with a cleaning agent such as REINGER to remove residues from previous materials and prevent unwanted chemical reactions.
Next, pressure hoses and fittings matched to the type of packers to be used in the injection process are installed. The entire system should be stable and ready to work under high pressure – often reaching up to 200 bar.
Filling the pump with resin
Polyurethane resin can be single- or two-component. In the case of two-component resins, thorough mixing of components in appropriate proportions is necessary until a homogeneous consistency is achieved. Mixing is done mechanically to ensure full activation of the chemical reaction. For this repair, we used single-component HYDROFOAM resin.
The prepared resin is carefully poured into the pump tank, avoiding aeration of the material. Before starting the actual injection, it is advisable to perform a test injection to ensure the pump operates smoothly and the resin is delivered without interruption.
Injection stage
The pump is connected to packers previously installed in injection holes. Injection begins from the lowest point of the crack (in case of vertical cracks) or from one end (for horizontal cracks). Resin is injected under pressure, filling the crack and penetrating the concrete structure.
The process continues until resin begins to flow from adjacent packers or from the crack itself – indicating complete filling of the space. After completing injection at a given point, the packer is closed or removed, and the pump is switched to the next hole.
After injection completion, the resin needs time to cure – typically from several dozen minutes to several hours. After this time, a tightness check is performed, and packers are not removed immediately – it is best to leave them for 24–48 hours, then cut them off and fill the holes.
Sealing leaks in underground garage
We supplied material for sealing leaks occurring at the junction of the foundation slab with the foundation wall of the garage.
The repair was performed through pressure injection of HYDROFOAM resin.
We describe the entire repair process step by step:
Surface preparation before pressure injection
The process begins with a thorough assessment of the leak location to identify its course, depth, and potential branches. Next,surface cleaning is performed, which includes removing all contaminants — dust, grease, concrete residue, loose plaster fragments, or paint. A clean surface ensures better adhesion of injection materials and eliminates the risk of their detachment.
Preparation of injection holes before pressure injection
The process begins with marking a grid of injection holes along the crack or leak location. Holes are typically spaced 20 to 50 cm apart, depending on the type of structure, crack depth, and injection material used. Their arrangement aims to ensure uniform distribution of resin throughout the entire leak volume.
Next, drilling of holes is performed — typically at a 45° angle to the surface, so that the hole tip is positioned as close as possible to the crack. Drilling depth is selected individually, most commonly in the range of 5–10 cm, depending on the thickness of the structural element.
After drilling the holes, their interior is cleaned of dust and concrete debris — most commonly with compressed air or special brushes. This stage is extremely important because contaminants can hinder resin penetration and weaken its adhesion to the concrete structure.
The next step is installation of injection packers — special valves through which the sealing material will be injected. They must be securely fastened to withstand the pressure of the injected resin.
Finally, before the actual injection, a packer tightness test is performed and hole patency is checked. Only properly prepared holes guarantee effective crack filling and permanent structural sealing.
The first step is preparing the injection pump – a device that injects resin under appropriate pressure into the structure interior. The pump must be technically sound, tight, and clean. Before use, it should be flushed with a cleaning agent such as REINGER to remove residues from previous materials and prevent unwanted chemical reactions.
Next, pressure hoses and fittings matched to the type of packers to be used in the injection process are installed. The entire system should be stable and ready to work under high pressure – often reaching up to 200 bar.
Filling the pump with resin
Polyurethane resin can be single- or two-component. In the case of two-component resins, thorough mixing of components in appropriate proportions is necessary until a homogeneous consistency is achieved. Mixing is done mechanically to ensure full activation of the chemical reaction. For this repair, we used single-component HYDROFOAM resin.
The prepared resin is carefully poured into the pump tank, avoiding aeration of the material. Before starting the actual injection, it is advisable to perform a test injection to ensure the pump operates smoothly and the resin is delivered without interruption.
Injection stage
The pump is connected to packers previously installed in injection holes. Injection begins from the lowest point of the crack (in case of vertical cracks) or from one end (for horizontal cracks). Resin is injected under pressure, filling the crack and penetrating the concrete structure.
The process continues until resin begins to flow from adjacent packers or from the crack itself – indicating complete filling of the space. After completing injection at a given point, the packer is closed or removed, and the pump is switched to the next hole.
After injection completion, the resin needs time to cure – typically from several dozen minutes to several hours. After this time, a tightness check is performed, and packers are not removed immediately – it is best to leave them for 24–48 hours, then cut them off and fill the holes.
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