This paper presents an innovative approach to enhancing the waterproofing properties of concrete through the incorporation of discarded rubber tyre crumb. With increasing environmental concerns surrounding tyre waste, this research explores the potential of using rubber crumb as an eco-friendly additive to improve the durability and water resistance of concrete. The study systematically evaluates the performance of concrete blocks with varying percentages of rubber tyre crumb, analysing their impact on key properties such as water permeability and split tensile, compressive strength, flexural strength tests and overall durability. Experimental results indicate that the inclusion of rubber crumb significantly reduces water absorption and permeability, offering promising improvements in waterproofing while also addressing the issue of tyre waste management. The findings demonstrate that rubber crumb not only provides an effective barrier against moisture ingress but also effectively contributes to the sustainable use of recycled materials in construction. This research underscores the viability of discarded rubber tyre crumb as a valuable additive in concrete production, paving the way for more sustainable construction practices and environmental benefits. The study concludes with recommendations for optimizing the rubber crumb content to balance performance and cost-effectiveness, offering a practical solution to enhance concrete’s waterproofing characteristics while supporting waste reduction efforts.