Sweating chilled water pipes (CWP) can be a significant source of building dampness and mold. Lines supplying chilled water to air handling units are insulated to prevent surface condensation and conserve energy. Insufficient insulation, incomplete sealing during installation and damage during maintenance are common, allowing condensation to form on surfaces, eventually wetting the insulation and supporting mold growth. A protocol for assessing and remediating mold on CWP insulation and ensuring effective re-insulation, through effective quality control was developed in conjunction with a project for replacing failed CWP insulation in 15 schools. Cost-effective resolution of mold growth WP was demonstrated.