Retrofits for a greener home

Building envelope: Foundation waterproofing

Photo of waterproofing membrane being applied to a home's foundation

Protect your home from flooding

Prevent water from penetrating your home's foundation

Foundation waterproofing is the process of preventing water from penetrating a building's foundation, protecting it from moisture damage, leaks, and structural issues. It involves applying various materials and techniques to create a barrier against water intrusion. There are two different areas waterproofing can be applied to:

Exterior Waterproofing:

  • Best for new construction and long-term protection.
  • Involves applying waterproof membranes, coatings, or drainage systems outside the foundation.

Interior Waterproofing:

  • Best for existing homes and minor water issues.
  • Seals cracks and prevents moisture from entering basement walls and floors.

Importance of foundation waterproofing:

  • Prevents water damage: Stops water from seeping into basements and crawl spaces.
  • Reduces mold and mildew growth: Keeps indoor air quality safe by preventing moisture buildup.
  • Protects structural integrity: Prevents cracks, erosion, and deterioration of foundation materials.
  • Enhances property value: A dry, stable foundation increases home longevity and resale value.

What to look for

  • Choose the right method for your foundation type. Exterior waterproofing is best for preventing water from entering, while interior solutions like sump pumps help manage water that has already infiltrated. Combining both offers the most effective protection.
  • Ensure the contractor you hire is certified and experienced in foundation waterproofing to guarantee quality installation and long-term results.
  • Choose high-quality waterproof coatings or membranes that are resistant to moisture, durable, and suitable for your climate.
  • Look for warranties or guarantees from contractors or manufacturers, ensuring the work is backed for long-term protection.

Things to consider

  • The type of soil and landscaping around your home will affect water flow. Ensure proper grading around the foundation to direct water away from the building.
  • Look for eco-friendly materials that do not release harmful chemicals such as silicone-based sealants, bentonite clay, or water-based
  • The level of accessibility to your foundation may affect the complexity of the waterproofing process. Some methods may require excavation or substantial landscaping work.

Average cost

$110 per linear foot

Financial help available for foundation waterproofing

No incentives available.

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