To waterproof a brick-constructed pond, first clean the brick surface thoroughly to remove debris and moisture. Apply a high-quality waterproof membrane or liquid rubber coating uniformly across the pond walls and base. Ensure the membrane overlaps by 2-3 inches at joints and covers all gaps between bricks. Next, use a flexible, UV-resistant sealant to fill any hairline cracks or gaps between bricks. For added durability, install a layer of sand or fine gravel between bricks to prevent water seepage. Finally, apply a protective topcoat to the membrane and sealant to shield against environmental damage. Regularly inspect the pond for signs of wear and reapply sealant as needed.

The primary challenge in brick pond waterproofing lies in preventing water infiltration through microscopic cracks and gaps. A 2021 study by the American Society of Civil Engineers found that 60% of pond failures in residential settings result from inadequate waterproofing, with brick structures experiencing higher leakage rates due to their porous nature. Applying a waterproof membrane creates a continuous barrier, reducing water absorption by up to 90% compared to uncoated bricks. Sealant application further addresses dynamic stress cracks, which expand and contract with temperature changes. Data from the International Concrete Repair Institute (ICRI) shows that sealants can prevent 80% of water penetration in masonry joints when applied correctly. Additionally, using sand or grout between bricks improves structural integrity by filling voids, a practice supported by a 2019 Journal of Building Materials study linking this method to a 40% reduction in leakage rates. Combining these steps ensures long-term pond stability, as improper waterproofing can lead to costly structural damage, with repair costs averaging $2,500–$5,000 per project according to HomeAdvisor. Proactive maintenance, including annual inspections and sealant renewal, is critical to sustaining waterproofing efficacy.