Revolutionary Roofing Solutions with Kson R321 Water-based Asphalt Coating
With a large number of buildings in China entering the maintenance and renovation phase, the leakage problem of roofs, especially traditional asphalt roofing membranes, has become increasingly prominent. Traditional asphalt materials are prone to sticking to the feet in high temperatures and cracking in low temperatures, and are difficult to construct at complex nodes, which have long been困扰ing both contractors and owners. Kson Civil Building Materials Co., Ltd. has launched Kson R321 water-based asphalt waterproofing coating, which, with its unique core technologies such as "asphalt base compatibility repair," "non-sticky to the feet when exposed," and "penetrating and repairing cracks," has performed excellently in many practical applications, providing innovative solutions for roof renovation.

Kson R321 is not just a simple material replacement but a technical innovation targeting the pain points of asphalt-based waterproofing systems. "One-time waterproofing, done once" is not just a slogan but a strict commitment to the durability and reliability of the product. Kson R321 turns this commitment into reality through three core technologies:
Kson R321, belonging to the asphalt base material category like mainstream SBS/APP modified asphalt membranes, has an innate excellent compatibility. Its creep and penetration characteristics can effectively fill in joints, damaged areas, and fine cracks of membranes, forming a "welding" type of sealing effect, avoiding the risk of delamination due to material incompatibility, and is particularly suitable for precise repair and reinforcement of asphalt membranes.

Kson R321 water-based asphalt waterproofing coating is ready to use right out of the bucket, with convenient construction. Using special modification technology, the surface is not sticky to the feet or dusty even under the scorching sun in summer, completely solving the pain points of difficult construction and affecting later maintenance of traditional asphalt materials in summer, ensuring the safety of construction personnel and facilitating the subsequent inspection and activities on the roof.

R321 has a low surface tension and excellent fluidity, which can penetrate into the micro-cracks of the base layer to achieve "repair from the inside out," not only dealing with surface problems but also strengthening the overall waterproof and anti-seepage ability of the base layer, especially suitable for concrete roofs with fine cracking or potential cracking risks.

Roof leakage has been a long-standing "disease" bothering owners, and repeated repairs not only consume costs but also affect normal life and production. Since its launch, Kson R321 water-based asphalt waterproofing coating has gained high recognition in the market due to its advantages such as asphalt membrane repair, non-sticky to the feet when exposed, and penetrating and repairing cracks, becoming a popular product. It has been successfully applied to many waterproofing projects across the country, providing long-lasting solutions for a large number of roofs suffering from leakage. Through thousands of project sites, the reliability of the product has been rigorously tested by different regions and climates.

Project Background: The factory is located in Shandong, with a typical temperate monsoon climate. The roof temperature can reach above 70℃ in summer and drop to -15℃ in winter. The original commercial housing roof has cracked and aged due to long-term thermal expansion and contraction, causing serious leakage.
Solution: Kson R321 is used to repaint and repair the cracked and aged roof, forming a seamless elastic waterproof coating.
Application Effect: After going through a complete winter and summer cycle, the repaired area is intact and undamaged. The coating is not sticky to the feet and does not flow in high temperatures in summer, and maintains elasticity and no cracking in low temperatures in winter, effectively solving the production and storage hazards of the factory. The owner highly praised the excellent performance of the product in withstanding high and low temperatures and said, "R321 truly does 'one-time waterproofing, done once,' solving our long-standing problem."

Project Background: The Anhui region has high temperature, high humidity, and large temperature difference. The self-built house roof in Anhui has water leakage hazards due to aging over time.
Solution: Use R321 with membranes to wrap and reinforce all details and joints. Its water-based environmental characteristics ensure safe construction without odor, and it is firmly bonded with membranes.
Application Effect: After construction, the roof's wind resistance and sealing performance have been significantly improved. The excellent weather resistance and "non-sticky to the feet" characteristics of the product make it very convenient for subsequent roof inspection and maintenance, avoiding the risk of damaging the waterproof layer due to foot traffic, and providing customers with long-lasting and worry-free protection.

The successful application of Kson R321 marks the advancement of roof waterproofing renovation from "simple covering" to "precise repair and performance improvement." In 2025, Kson R321 has been completely upgraded in terms of performance and appearance, cleverly combining the traditional advantages of asphalt materials with the modern construction friendliness of water-based coatings, especially suitable for the roof leakage repair and old house renovation market with high requirements for construction efficiency, safety, and durability.

Song, the product manager of Kson Building Materials, said that the company has always adhered to product iteration driven by technological innovation. The launch of R321 is another example of Kson's "one-time waterproofing, done once" brand commitment. In the future, Kson will continue to focus on the pain points of the waterproofing field in civil construction and provide more efficient, environmentally friendly, and reliable "one-stop" solutions like R321, continuously protecting the beautiful lives of thousands of households.
About Kson Civil Building Materials Co., Ltd.:
Kson Civil Building Materials Co., Ltd. is a wholly-owned subsidiary of Kson Stock Co., Ltd. (Stock Code: 300737), focusing on providing one-stop building materials solutions for the civil construction market, including pipes, waterproofing, sand powder, and accessories. The company's products have won many international and domestic authoritative certifications and are committed to building a beautiful living environment through innovative technology and professional services.
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