Description

Polyurethane (PU) Injection Grouting is a specialized non-destructive waterproofing technique used to seal active water leaks, repair concrete cracks, and fill internal structural voids. Liquid PU resin is injected under high pressure into cracks or joints, where it reacts with moisture to expand rapidly and form a durable, watertight, flexible rubberized seal.Key ApplicationsActive Water Leakages: Immediately stops gushing water ingress in basements, lift pits, retaining walls, and underground structures.Concrete & Joint Sealing: Fills hairline cracks, expansion joints, honeycombed concrete, and construction joints in slabs, roofs, water tanks, and swimming pools.Infrastructure Works: Ideal for high-pressure leak sealing in tunnels, dams, bridge decks, and drainage culverts.Common Types of PU GroutHydrophilic Resins: Absorb moisture and swell in contact with water; ideal for wet environments and dynamic joints with recurring movement. Hydrophobic Resins: Repel moisture and form a rigid, highly stable foam; effective for high-volume void filling and aggressive water pressures. Standard Step-by-Step Execution ProcessInspection & Mapping: Locating water seepage entry points, joint lines, and crack patterns.Drilling Port Holes: Drilling ports at a 45-degree angle intersecting the targeted crack internally.Packer Installation: Inserting mechanical high-pressure injection packers (ports) into the drilled holes. Surface Pre-Sealing: Patching surface cracks with fast-setting epoxy or mortar to prevent backflow during high-pressure injection. High-Pressure Injection: Pumping liquid PU resin into packers using specialized mechanical injection pumps until expansion fills all void spaces completely. Finishing & Patching: Removing packers after curing and filling port holes with waterproof mortar. Primary AdvantagesFast-Acting: Expands in minutes to cut off active high-velocity leaks. Flexible & Moveable: Cured PU retains elasticity, allowing it to withstand thermal expansion, structural vibrations, and concrete movement without cracking. Minimally Invasive: Requires no hacking or demolition of tiles or structural elements. We are using Normat, CYH 500, Fosroc Nitofill PU 1F, Essr Bond GS 500, Easy Grout