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Waterproofing

Keep water out for good — basement, foundation & exterior

Stop the Leak — Free Inspection → Call Us Today

Why Choose Allstate?

NYC DOB Licensed & Insured

Free Written Estimates

5-Year Workmanship Warranty

Local Law 11 Expertise

Clean Jobsite Guaranteed

About This Service

Professional Waterproofing in NYC

Water intrusion is one of the most damaging and costly problems a building owner can face. Allstate Construction provides comprehensive waterproofing solutions for basements, foundations, roofs, balconies, and exterior walls. We identify the source of leaks and apply the correct system — not just a patch.

The Allstate Difference

We are certified applicators for Tremco, BASF, and Sika waterproofing systems. Every waterproofing project includes a written warranty backed by the manufacturer.

What's Included

Our Waterproofing Services

Exterior foundation waterproofing (excavation)
Interior basement waterproofing systems
French drain and sump pump installation
Crystalline waterproofing (Xypex, Kryton)
Negative-side waterproofing (hydraulic cement)
Balcony and deck waterproofing membrane
Below-grade wall waterproofing
Window well waterproofing
Crack injection (epoxy & polyurethane)
Drainage mat and dimple board systems

Our Process

How We Handle Your Waterproofing Project

Step by step — from first contact to finished job

Water Investigation

We trace the source of water entry — often different from where it appears inside.

System Design

We specify the correct waterproofing approach: exterior, interior, or combined system.

Installation

Licensed crew installs the waterproofing system with all required drainage components.

Testing & Warranty

Flood test or hose test performed. Written waterproofing warranty issued.

FAQs

Common Questions About Waterproofing

Exterior waterproofing stops water at the source and is the most effective. Interior systems manage water that has already entered. We recommend exterior when accessible.

Yes. Intermittent leaks indicate water is finding a path through cracks or porous concrete. It worsens over time and causes mold and structural damage.

A properly installed exterior membrane system lasts 20+ years. Interior systems with a sump pump are also long-lasting with proper maintenance.