Polyurethane Waterproof Coating

Polyurethane waterproof coating is a reactive coating that cures into a highly elastic rubber-like membrane. It offers excellent tensile strength, elongation, and abrasion resistance, bridging substrate cracks. Outstanding water and chemical resistance make it suitable for long-term immersion. Our polyurethane coatings include classic, damp surface, water-based, and high-temperature topcoat versions for various climates and conditions. Widely used on roofs, bathrooms, swimming pools, basement slabs, and walls. Its seamless membrane formation is ideal for irregular joints and complex details, making it one of the most common coatings in residential and industrial waterproofing.

TYPES OF POLYURETHANE WATERPROOF COATINGS

KINJOYA PU 3H CLASSIC

High solids, VOC-compliant, single-component, moisture-curing polyurethane membrane. Available in Flat substrate and Sagging Resistant viscosities for horizontal and vertical surfaces. Excellent tensile strength and elongation.

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KINJOYA PU AQR

High solids, VOC-compliant, one-part, rapid moisture-curing polyurethane membrane. Good adhesion to wet substrates. Available in FS and SR viscosities for horizontal and vertical applications. Excellent tensile strength and elongation.

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KINJOYA PU HYD

High-solid-content, VOC-compliant, single-component, fast moisture-curing polyurethane membrane. Good adhesion to damp substrates. Curing speed can be increased by stirring with water at lower temperatures.

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Key Advantages of Polyurethane Waterproof Coating

High Elasticity and Crack Bridging Ability

Polyurethane coatings cure to form a highly elastic membrane that accommodates substrate movement and bridges existing or developing cracks. This elasticity remains effective across a wide temperature range, ensuring the waterproof layer stays intact as buildings settle, vibrate or undergo thermal expansion. The material's flexibility makes it particularly valuable on roofs and other structures subject to dynamic stresses.

Strong Adhesion and Seamless Protection

The reactive nature of polyurethane creates excellent adhesion to various substrates including concrete, metal and wood. Applied as a liquid, it flows into pores and irregularities, curing to form a continuous, joint-free membrane. This seamless characteristic eliminates potential weak points found in sheet materials, providing reliable waterproofing especially around complex details and penetrations.

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High Elasticity and Crack Bridging Ability

Typical Applications for Polyurethane Waterproof Coating

Roof and Balcony Waterproofing

Polyurethane coatings are widely used on flat roofs, pitched roofs and balconies where their seamless membrane prevents water ingress through joints and cracks. Their ability to remain flexible under temperature extremes ensures long-term performance in exposed conditions. The coatings form a durable surface that can withstand foot traffic during maintenance activities.

Basement and Wet Area Protection

Below-grade structures such as basement walls and slabs benefit from polyurethane's resistance to hydrostatic pressure and moisture. In bathrooms, kitchens and laundry rooms, these coatings create reliable barriers around drains and pipe penetrations where water exposure is frequent. Their seamless application eliminates grout lines and joints that can leak in tiled areas.

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Flexibility and Substrate Adaptability of Polyurethane Waterproof Coating

Polyurethane waterproofing coating cures into a highly elastic, rubber-like film with high elongation at break. This exceptional elasticity allows it to accommodate building movements caused by temperature changes, settlement, or loads by stretching with the substrate without cracking. Furthermore, it exhibits strong adhesion to various substrates like concrete, mortar, metal, and wood. As a liquid, it penetrates and wets surfaces to form a continuous layer that bonds tightly, even over hairline cracks. This adaptability makes it ideal for both new and existing projects, especially for roofing and basement slabs prone to cracking.