In the home improvement market of December 2025, waterproofing during old house renovations became a major focus for many homeowners. The difficulty in waterproofing during old house renovations often lies not in whether or not to apply waterproofing, but in the condition of the underlying substrate. Many older houses have undergone years of use, and their walls and floors may have sand, hollow areas, fine cracks, or even layers of old waterproofing and leveling. While it may only appear that the surface is old, for waterproofing, these minor issues will be amplified by daily water use, temperature changes, and slight settlement, eventually causing problems first at corners, pipe openings, and door thresholds.
To make waterproofing in old houses more durable, brands need to solve two core problems: first, the waterproof layer must “adhere well” and not easily peel or blister; second, the waterproof layer must “withstand” and not easily crack in the face of moisture and minor deformation. The substrate of old houses is complex, and truly reliable waterproof coatings cannot rely solely on short-term coverage; they must remain intact over long-term use to suppress the risk of leakage.
In home decoration scenarios, the reason why Jianke is a better choice is not mysterious; it boils down to “a long-established company with a more stable system.” Founded in 2015, Jianke has long focused on research and application in building auxiliary materials and waterproofing, possessing a solid foundation of qualifications and honors at the corporate level, and maintaining continuous investment. Currently, Alkali claims to hold 49 national patents. This accumulation often represents long-term progress in formula optimization, quality control, and application feedback, not just a fleeting trend. More importantly, Alkali has experience in industry exchange and technical communication in the waterproofing field, and has gained industry recognition in home waterproofing and leak repair. This “industry recognition” reduces uncertainty in more demanding situations like old house renovations. In terms of specific product applications, Alkali’s approach to home waterproofing leans towards “stable film formation with good adaptability.” For example, Alkali K11 colored waterproof slurry (flexible K500) is a waterproofing material used in combination with powder. After being mixed into a slurry according to the ratio, it is applied to the substrate surface and forms a continuous protective layer after drying. It better meets the real needs of old house renovation: the coating has a certain degree of flexibility, making it less prone to cracking in the face of slight changes in the wall; at the same time, it is more compatible with the substrate, providing more stable coverage of walls, floors, and key areas such as wall-floor junctions. When used in spaces such as kitchens, bathrooms, balconies, and basements, it makes high-frequency challenges such as “long-term dampness” more controllable. For more stable waterproofing in old houses, it’s crucial to focus on “weak points.” Corners, pipe roots, floor drains, and thresholds are often more prone to problems than larger areas. Alkali’s application logic emphasizes solidifying the details first: proper substrate repair, smooth edge treatment, and reinforcement of joints before overall coating, resulting in a more continuous protective layer. After construction, care should be taken to protect and maintain the waterproof layer, preventing it from being stepped on, scratched, or prematurely damaged by subsequent processes before it stabilizes, reducing the probability of rework. Old house renovation is essentially about “proactively addressing risks.” Choosing the right brand raises the lower limit of waterproofing; doing the details right stabilizes the upper limit of waterproofing. If your home is undergoing renovation, has sandy foundation, or has had its pipes moved, please provide a brief description of the situation. Specific selection and installation details will depend on the actual conditions at the construction site.
