Waterproofing Contractors Insurance Requirements

Waterproofing contractors protect your building's structural components from water infiltration — the single most destructive force acting on buildings over time. Failed waterproofing can lead to foundation damage, mold growth, steel corrosion in parking structures, and interior water damage across multiple floors. The long-tail nature of waterproofing claims makes this trade particularly important from an insurance perspective: defective waterproofing may not fail for months or years after application. Require waterproofing contractors to carry a minimum of $1M/$2M in GL coverage with strict verification of completed operations coverage extending at least 5 years after project completion. Waterproofing defects are almost always discovered long after the work is done, making completed operations the most critical coverage component. For large-scale projects (foundation waterproofing, parking deck coatings, plaza deck membranes), require $2M/$4M GL limits. Waterproofing contractors use a variety of chemical products including hot-applied membranes, solvent-based coatings, and polyurethane foam that create fire, fume, and environmental hazards. Verify that the contractor's GL policy covers hot work if torch-applied membranes are used, and require pollution liability for chemical application. For below-grade waterproofing, the contractor should carry professional liability if they are responsible for system design or product selection.