According to WPB, with a view to meet the increasing challenge of roof leakages, especially on traditional asphalt‑sheet roofs in the ageing building stock of China, 科顺民用建材有限公司, or KS Runtu, is launching its R321 water‑based bitumen waterproof coating as a so-called "one‑stop" solution for modern roof‑repair needs.
The company says that R321 addresses three major industry pain points: compatibility with asphalt-based sheet membranes, safe application under extreme surface temperatures, and deep penetration for micro-crack repair. Unlike typical asphalt repair materials, R321 is engineered to bond seamlessly with SBS and APP modified bitumen membranes, filling overlaps, breaches and fine cracks to form welded‑like continuity and eliminate delamination risk.
Furthermore, due to its special formulation, it reduces stickiness under high heat, even in direct sun, while remaining pliable in intense cold; this enhances safety and durability both at installation and during subsequent inspection.
It exhibits low surface tension and improved flow characteristics. The deep infiltration into substrate micro-cracks allows it to reinforce waterproofing from inside the concrete rather than just providing a surface layer of protection.
Real-world case studies reinforce its performance:
A factory roof in Shandong endured rooftop temperatures above 70 °C in summer and as low as –15 °C in winter. After application, the repaired zone remained intact through a full seasonal cycle - no de-bonding in heat, no cracking in cold.
One owner said, "R321 truly delivered 'waterproof once, waterproof for good' and solved our long-standing leak problem."
In Anhui, a self‑built residential roof subject to high heat, humidity and aging saw marked improvement in wind‑uplift resistance and maintenance ease thanks to the coating’s “foot‑safe” surface and tight adhesion to membrane joints. KS Runtu believes the R321 launch now creates a paradigm shift in asphalt-based repair, blending traditional bitumen durability with the ease and ecological benefits of a water-based system.
Speaking about the future, the company's product leader Mr Song said the firm remains committed to resolving civil-building waterproofing challenges through high-efficiency, eco-friendly, reliable one-stop solutions.
By WPB
News, Bitumen, Waterproof
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