Cementitious Waterproof Coating

Cementitious waterproof coating is suitable for both positive and negative side waterproofing of concrete structures. Our formulation includes classic polymer-modified cementitious types and crystalline types, which actively seal micro-cracks through internal crystal growth. Ideal for basements, pools, tunnels, and hydraulic engineering projects, this coating provides durable concrete protection against hydrostatic pressure. The polymer-modified version offers enhanced flexibility and adhesion, while the crystalline type delivers self-healing properties. Both options ensure excellent vapor permeability and resistance to harsh environments. They form a permanent integral bond with concrete, making them a reliable choice for critical infrastructure and water-retaining structures.

TYPES OF CEMENTITIOUS WATERPROOF COATINGS

KINJOYA POLYMER CEMENT

Two-component water-based coating made from acrylate polymer emulsion and cement. Solvent-free, non-combustible, non-toxic. Offers aging resistance, low-temperature flexibility, high adhesion, water resistance, and crack resistance.

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KINJOYA CMCC

Powdered cement-based capillary crystalline waterproof coating. Composed of Portland cement, active compounds, and silica sand. Active chemicals penetrate concrete, react with free lime and water to form insoluble crystals, filling pores for dense waterproofing.

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Key Advantages of Cementitious Waterproof Coating

Excellent Bond with Concrete Substrates

Cementitious coatings share a similar composition with concrete, creating a strong chemical and mechanical bond that becomes virtually integrated with the substrate. This compatibility ensures the coating will not delaminate or peel over time, even under damp conditions or hydrostatic pressure. The bond strength often exceeds that of the concrete itself, providing long-term reliability for structures.

Breathable Waterproof Protection

These coatings allow water vapor to escape from the concrete while preventing liquid water from penetrating. This breathability is critical for below-grade structures where moisture trapped in walls could cause efflorescence, freeze-thaw damage or coating failure. The microporous structure maintains the substrate's ability to dry naturally while providing an effective barrier against water ingress.

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Typical Applications for Cementitious Waterproof Coating

Water Retaining Structures

Cementitious coatings are ideal for potable water tanks, swimming pools, reservoirs and fountains where contact with drinking water is involved. Their non-toxic composition meets health standards for water contact, and their strong bond to concrete creates seamless linings that prevent leakage. The coating becomes part of the structure, resisting cracking from water pressure and temperature changes.

Below-Grade and Foundation Waterproofing

For basements, foundations, tunnels and underground parking structures, these coatings provide reliable protection against groundwater and soil moisture. They can be applied to both positive and negative sides of walls, making them versatile for new construction or remedial work. Their ability to cure in damp conditions is particularly valuable for below-grade applications where complete drying is impractical.

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Below-Grade and Foundation Waterproofing

Environmental and Health Safety of Cementitious Waterproof Coating

Cementitious waterproof coatings are made primarily from inorganic minerals with no organic solvents added. They require only water mixing during application, achieving zero VOC emissions and ensuring safety for applicators and indoor air quality. This inherent eco-friendliness meets strict green building standards for hospitals and schools. The cured coating exhibits chemical inertness similar to concrete, with leachate passing drinking water quality tests, making it the preferred choice for potable water tanks and food processing facilities requiring food-grade safety.