The role involves assessing and monitoring the performance of waterproofing admixtures used in concrete to ensure they meet approved specifications and quality standards. It includes checking correct dosage, mixing procedures, placement, and curing practices to achieve effective reduction in permeability and prevent leakage. The responsibility also covers coordinating and reviewing laboratory and site tests to verify admixture performance under actual site conditions. Proper documentation, reporting of non-conformities, and recommending corrective actions are essential to ensure durability and long-term structural protection.