Polyurethane Waterproof Coating
Experience Ultimate Solvent-Free Defense with the Best Polyurethane Waterproof Coating from Great Ocean. Enjoy liquid roofing perks without odors—ideal for restricted sites. Our high-solids, cold-applied formula creates a seamless, impermeable membrane fast, with top ponding resistance, UV protection, and durability against leaks, wear, corrosion, and weathering. Compatible with existing roofs (flat, sloped, domed)—even damaged ones.
Polyurethane Waterproof Coating for Sale
While this page features our core systems, Great Ocean Waterproof offers a comprehensive portfolio of advanced waterproofing solutions designed to meet diverse construction requirements. We are committed to providing the right material for every project. If you have questions about specific product specifications, customization options, or need a competitive polyurethane waterproof coating price, please do not hesitate to reach out. Contact our team anytime—we are ready to assist you and guarantee a reply within 2 hours.
Advantages of Polyurethane Waterproofing
Polyurethane waterproofing offers a range of superior benefits, making it an ideal choice for protecting structures from moisture damage. Below, we explore key advantages, including energy efficiency, anti-carbonation properties, and more, ensuring long-term performance and cost savings.
Energy Efficiency
Polyurethane waterproof coatings contribute to energy efficiency by providing excellent thermal insulation, reducing heat transfer through roofs and walls. This helps maintain stable indoor temperatures, lowering heating and cooling costs in buildings. Their reflective properties can also minimize solar heat gain, supporting sustainable and eco-friendly construction practices.
Anti Carbonation
With strong anti-carbonation capabilities, polyurethane waterproofing prevents carbon dioxide from penetrating concrete surfaces, which can otherwise lead to corrosion of reinforcing steel. This protective barrier extends the lifespan of structures in urban or industrial environments where CO2 exposure is high, maintaining structural integrity over time.
Water Pressure Resistance
These coatings excel in water pressure resistance, forming an impermeable membrane that withstands hydrostatic pressure from groundwater or heavy rainfall. Ideal for basements and foundations, they prevent water ingress even under high-pressure conditions, ensuring dry and secure interiors without compromising on flexibility.
Crack Bridging and Adhesion
Polyurethane systems provide exceptional crack bridging, spanning micro-cracks and accommodating structural movements without failure. Their strong adhesion bonds seamlessly to various substrates like concrete, metal, and wood, ensuring a reliable seal even on uneven or damaged surfaces, reducing the risk of leaks.
Flexibility
Offering high elasticity and elongation, polyurethane waterproofing remains flexible across a wide temperature range, preventing cracking due to thermal expansion or contraction. This adaptability makes it suitable for dynamic environments, such as rooftops or bridges, where movement is common.
Easy Application
Application is straightforward and versatile, with liquid formulations that can be sprayed, brushed, or rolled on, forming seamless membranes without joints. Quick curing times and low-odor options allow for minimal disruption, making it accessible for both professionals and DIY projects.
Durability and Longevity
Known for their robustness, polyurethane coatings resist UV rays, chemicals, abrasion, and weathering, delivering long-term protection that can last 10-20 years or more with proper maintenance. This durability minimizes repair needs, offering cost-effective solutions for demanding applications.
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How to Apply Polyurethane Waterproof Coating
Polyurethane is one of the most durable and flexible waterproofing solutions available, favored for its ability to bridge cracks and withstand thermal expansion. To ensure a long-lasting, watertight seal, proper application is critical.
While this material is versatile enough for various substrates like wood and metal, it performs best when applied to porous mineral surfaces. Specifically, using a high-quality polyurethane waterproof coating for concrete ensures excellent adhesion and creates a seamless, rubber-like membrane that protects the structure from water damage, UV rays, and foot traffic.
Below is a step-by-step guide to achieving a professional finish.
1. Surface Preparation
The most important step is preparation. The surface must be clean, dry, and sound.
Cleaning: Remove all loose debris, dust, oil, grease, or previous coatings. For concrete, a high-pressure wash or grinding may be necessary to open the pores.
Moisture Check: Ensure the substrate is completely dry. Trapped moisture can cause the coating to bubble or delaminate later.
Repair: Fill any cracks, voids, or honeycombs with a suitable polyurethane sealant or repair mortar before starting the main application.
2. Priming
Never skip the primer. A specialized primer acts as a bonding agent between the substrate and the coating.
Apply the primer evenly using a roller or brush.
Allow it to cure according to the manufacturer’s instructions (usually 4–6 hours) until it is tacky but not wet.
3. Detail Work (Fillets and Corners)
Before doing the main floor or roof area, reinforce the weak points.
Apply a thick coat of polyurethane to all internal corners, wall-floor junctions, and around drains or pipes.
Embed a reinforcing geotextile fabric into the wet coating at these junctions to prevent future tearing.
4. Application of the First Coat
Once the primer is ready and the details are sealed:
Mix: Stir the polyurethane coating thoroughly (using a mechanical mixer at low speed) to ensure a homogeneous consistency.
Apply: Pour the coating onto the surface and spread it evenly using a squeegee, notched trowel, or short-nap roller.
Coverage: Ensure you meet the recommended thickness (usually 0.5mm to 1mm per coat). Do not spread it too thin.
5. Application of the Top Coat
Most systems require two coats for maximum durability.
Wait for the first coat to dry (typically 12–24 hours). It should be walkable but still slightly tacky to ensure a chemical bond between layers.
Apply the second coat in a cross-direction (perpendicular) to the first coat. This ensures there are no pinholes or missed spots.
6. Curing
Allow the final system to cure fully—usually 48 to 72 hours—before allowing heavy foot traffic or water testing.
Applications of Polyurethane Waterproofing
Polyurethane waterproofing solutions offer versatile protection across various surfaces and environments, ensuring long-term durability against moisture, cracks, and environmental stressors. Our advanced formulations, including water-based options, provide seamless barriers that adapt to structural movements while maintaining eco-friendly performance.
Roofing Systems
For rooftops exposed to harsh weather, a polyurethane waterproof coating for roof delivers superior UV resistance and flexibility, preventing leaks on flat, sloped, or domed structures. It’s ideal for both new installations and repairs, compatible with existing materials like bitumen or metal.
Wood Surfaces
Protecting wooden decks, fences, or outdoor furniture from rot and water damage is effortless with a polyurethane waterproof coating for wood. This specialized application forms a breathable yet impermeable layer, enhancing longevity without altering the natural appearance.
Basements and Foundations
In below-grade areas prone to groundwater seepage, polyurethane coatings create robust moisture barriers, resisting hydrostatic pressure and mold growth for dry, secure spaces.
Green Roofs and Planters
Eco-conscious projects benefit from root-resistant polyurethane systems that support vegetation while safeguarding underlying structures from penetration and ponding water.
Industrial and Commercial Floors
For high-traffic areas like warehouses or parking garages, these coatings offer abrasion-resistant protection against chemicals, oils, and heavy loads, extending surface life.
Wet Areas in Buildings
Bathrooms, kitchens, and pools require quick-drying solutions; a water based polyurethane waterproof coating excels here, providing odorless application and seamless finishes that comply with hygiene standards.
Whether for residential, commercial, or industrial use, Great Ocean’s polyurethane waterproofing products ensure reliable, cost-effective defense tailored to your specific needs. Contact us for customized recommendations!
Application Case Studies
Case Study 1: Rooftop Waterproofing for Commercial Building in Shanghai
Project Overview: A large commercial complex in Shanghai faced recurring leaks on its flat rooftop due to heavy rainfall, thermal expansion cracks, and urban pollution. The 5,000㎡ roof area required a robust solution to handle extreme weather variations.
Challenge: The existing bitumen membrane was deteriorating rapidly, leading to frequent water ingress, interior damage, and high maintenance costs during monsoon seasons. Temperature fluctuations caused cracking, and solvent odors were restricted in the densely populated area.
Solution: Applied JY-DPU Double Components Polyurethane Waterproof Coating to create a seamless, flexible membrane. Its high-solids, cold-applied formula ensured no solvent emissions, while superior elasticity accommodated structural movements. Technical support included customized installation guidelines for optimal adhesion on the weathered substrate.
Results: No leaks reported after two years, with enhanced UV resistance and ponding water tolerance extending the roof’s lifespan by 10+ years. The quick 24-hour curing minimized downtime, saving the client on repair costs and earning praise for eco-friendly performance in a high-traffic urban environment.
Case Study 2: Basement Sealing for Residential Development in Beijing
Project Overview: A new residential high-rise in Beijing required reliable waterproofing for underground parking and basements, covering over 10,000㎡ prone to groundwater seepage and soil pressure.
Challenge: High water table, constant moisture, and structural settling risked flooding, mold growth, and corrosion of reinforcements, complicating compliance with green building standards in a humid climate.
Solution: Utilized JY-951 Waterborne Polyurethane Waterproof Coating for its low-VOC, odorless application. The single-component system was brushed on concrete walls and floors, forming an impermeable barrier with excellent adhesion and root resistance for adjacent green areas. Detailed application guides ensured compatibility with existing materials.
Results: The basements remained completely dry through multiple rainy seasons and harsh winters, preventing mold and corrosion. The project met environmental certifications, with the developer noting a 30% reduction in labor time due to quick drying and ease of use, plus long-term durability against weathering and chemical exposure.
Application Case Studies
Polyurethane waterproofing coatings and membranes are evaluated through various ASTM standards to ensure they meet performance criteria for durability, flexibility, and water resistance. These include specifications for the materials themselves and test methods for key properties. Below is a comprehensive overview based on established ASTM guidelines, focusing on those directly applicable or commonly used for liquid-applied polyurethane systems.
Key ASTM Specifications for Polyurethane Waterproofing
These standards outline the required properties and test methods for polyurethane-based waterproofing products:
- ASTM C836/C836M: Standard Specification for High Solids Content, Cold Liquid-Applied Elastomeric Waterproofing Membrane for Use with Separate Wearing Course. This covers properties like tensile strength, elongation, adhesion, and low-temperature flexibility for elastomeric membranes, including polyurethane types.
- ASTM C957/C957M: Standard Specification for High-Solids Content, Cold Liquid-Applied Elastomeric Waterproofing Membrane with Integral Wearing Surface. Similar to C836 but includes an integral wearing surface, applicable to polyurethane coatings for pedestrian or vehicular traffic areas.
- ASTM D6947/D6947M: Standard Specification for Liquid Applied Moisture Cured Urethane Coating Used in Spray Polyurethane Foam Roofing System. Focuses on moisture-cured polyurethane coatings for roofing, including tests for elongation, tensile strength, and water vapor permeance.
- ASTM D8463/D8463M: Standard Specification for High Solids Content, Cold Liquid-Applied Elastomeric Waterproofing Membrane for Use with Separate Wearing Course. A recent standard for one- or two-component polyurethane membranes, emphasizing elastomeric performance and application methods.
- ASTM D7832/D7832M: Standard Guide for Performance Attributes of Waterproofing Membranes Applied to Below-Grade Walls. Provides guidance on attributes like water resistance and adhesion for below-grade polyurethane applications.
Common ASTM Test Methods for Polyurethane Waterproofing
These tests assess critical performance aspects such as mechanical strength, water resistance, and adhesion. Many are referenced within the above specifications:
| Test Category | ASTM Standard | Description |
|---|---|---|
| Water Absorption | ASTM D570 | Measures the amount of water absorbed by the coating, indicating its waterproofing efficacy and resistance to swelling or degradation. |
| Water Vapor Transmission | ASTM E96 | Evaluates the rate at which water vapor passes through the membrane, crucial for breathability in certain applications. |
| Hydrostatic Pressure Resistance | ASTM D5385 | Tests the membrane’s ability to withstand water pressure without leaking, simulating groundwater or ponding conditions. |
| Water Resistance (Fog/Condensation) | ASTM D1735 | Assesses coating resistance to water in a fog apparatus, simulating high-humidity environments. |
| Water Resistance (Controlled Condensation) | ASTM D4585 | Determines resistance to water under condensing humidity conditions, helping predict long-term performance. |
| Tensile Strength and Elongation | ASTM D412 | Measures the coating’s tensile properties and ability to stretch without breaking, essential for flexibility and crack bridging. |
| Tear Resistance | ASTM D624 | Evaluates tear strength, indicating durability against mechanical damage. |
| Adhesion (Peel) | ASTM D903 | Tests peel adhesion to substrates like concrete, ensuring the coating bonds effectively. |
| Adhesion (Tape/Pull-Off) | ASTM D3359 / ASTM D4541 | Rates adhesion via tape test or pull-off strength, confirming bond integrity on various surfaces. |
| Hardness | ASTM D2240 / ASTM D3363 | Assesses shore hardness or pencil hardness, relating to wear resistance and surface toughness. |
| Crack Bridging | ASTM C1305 | Tests the ability to bridge cracks in substrates without failure, vital for dynamic structures. |
| Solids Content | ASTM D2369 | Determines the percentage of non-volatile solids, ensuring high solids for better coverage and performance. |
| Crack Cycling | ASTM C836 (Section within) | Evaluates performance under cyclic cracking at low temperatures. |
These standards and tests ensure polyurethane waterproofing products from Great Ocean meet industry benchmarks for quality and reliability. For specific product compliance or custom testing, consult our technical team or refer to the latest ASTM publications, as standards may evolve.
Frequently Asked Questions
What are the benefits of using polyurethane waterproof coatings from Great Ocean?
Our coatings provide long-lasting protection with high elasticity, eco-friendly formulations, and compatibility with various substrates. They resist ponding water, chemicals, and abrasion, ensuring your projects stay dry and secure for years while minimizing maintenance needs.
How much does a polyurethane waterproof coating cost?
The polyurethane waterproof coating price varies based on product type, quantity, and application needs. For accurate pricing, contact our sales team at [email protected] or request a quote—we offer competitive rates for high-quality, certified solutions tailored to your project.
Are polyurethane waterproof coatings environmentally friendly?
Yes, our waterborne polyurethane options are low-VOC and solvent-free, reducing environmental impact without compromising performance. They’re perfect for green building projects and areas with strict odor restrictions.
How long do polyurethane waterproof coatings last?
With proper application, our coatings can last 10+ years, depending on environmental factors. Their UV resistance and flexibility help them withstand expansion, contraction, and weathering, providing reliable long-term waterproofing.
Can polyurethane waterproof coatings be used on existing roofs?
Absolutely—they’re compatible with most existing roofing materials, even weathered or damaged ones. This makes them an excellent choice for repairs and upgrades without needing a full replacement.
