Mold growth on coastal walls is a big concern due to the high humidity and moisture levels that exist in these areas. Here, high-density polyethylene (HDPE) geomembranes are used to successfully reduce mold growth on coastal walls. The effectiveness of HDPE geomembranes in forming a barrier against moisture infiltration prevents conditions suitable to mold growth. Investigating the features of HDPE geomembranes that make them appropriate for this application, such as water impermeability and resistance to environmental degradation is necessary. Furthermore, it explores analytical ways for incorporating HDPE geomembranes into coastal wall construction and maintenance operations. The lack of proper theoretical and analytical study on use of geopolymers shows the necessity for a new method for such analysis. The current study looks into elements such as material composition, wall thickness, application processes, and drainage systems to improve the performance of coastal walls in reducing capillary rise damming. Furthermore, a comparison of the environmental and economic benefits of geomembranes wrapped walls in coastal settings is shown, along with a pressure analysis of standard and geomembranes wrapped walls. The findings show considerable reductions in capillary rise-induced damage, demonstrating the promise of this novel method for coastal preservation and sustainable development. Geomembrane mix walls can be an efficient solution for controlling capillary rise damage in coastal structures while also providing a long-lasting, cost-effective, and environmentally friendly alternative to standard wall systems. More research and implementation efforts are required to fully actualize. Mold development caused by capillary rise is a common problem in buildings, particularly in coastal areas with inadequate moisture management. Capillary rise refers to the movement of water through porous materials (such as soil or building materials) produced by capillary action, which occurs when the adhesion forces between the water and the medium surpass the cohesion forces inside the water molecules. This analysis-based research seeks to contribute to the development of sustainable and resilient coastal infrastructure solutions by investigating the potential of HDPE geomembranes to protect coastal walls from mold growth.