Professional Waterproofing Services | Bronx & Nassau County

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The cost of basement waterproofing — interior waterproofing and/or exterior waterproofing with excavation — varies significantly based on the method and extent of work needed as well as basement size and accessibility. We provide free inspections and detailed estimates for all projects.

Exterior waterproofing prevents water from reaching foundation walls by applying waterproof membranes and installing drainage systems outside. It's more effective but requires excavation. Interior waterproofing manages water that has already entered by installing drainage channels and sump pumps inside the basement. It's less invasive and more affordable. We'll recommend the best approach based on your situation.

Quality waterproofing systems can last up to 20 years or more depending on materials and installation quality. Exterior membrane waterproofing can last 20+ years, while interior systems require occasional pump maintenance but the infrastructure lasts decades. We use commercial-grade materials and provide warranties on our work.

Interior waterproofing can be done year-round. Exterior waterproofing is weather-dependent — we need temperatures above freezing for proper concrete curing and membrane adhesion. However, we can perform emergency crack repairs and temporary solutions in winter, then complete permanent exterior work in spring. We'll recommend the best timing for your specific project.

Waterproofing eliminates the moisture source that causes mold, but existing mold must be professionally remediated separately. Once we waterproof your basement and the area dries out completely, mold cannot regrow without moisture. We can coordinate with mold remediation specialists if needed.