Understanding foundation waterproofing membrane

Foundation waterproofing is a crucial aspect of construction that ensures the longevity and structural integrity of buildings. Among the various methods employed for waterproofing, the use of foundation waterproofing membranes stands out as an effective solution. In this guide, we'll explore what foundation waterproofing membranes are, their types, benefits, and installation process.

What is a Foundation Waterproofing Membrane?

A foundation waterproofing membrane is a barrier applied to the exterior of a foundation to prevent water penetration. It acts as a protective layer that shields the foundation from moisture, preventing water damage and seepage. These membranes are designed to be durable, flexible, and resistant to environmental factors.

Types of Foundation Waterproofing Membranes

  1. Bituminous Membranes:
    • Made from asphalt or bitumen.
    • Flexible and self-adhesive options available.
    • Provides excellent waterproofing capabilities.
  2. Cementitious Membranes:
    • Composed of cement and polymers.
    • Forms a seamless, rigid barrier when applied.
    • Ideal for both new construction and repair work.
  3. Liquid Membranes:
    • Applied as a liquid and cured to form a flexible membrane.
    • Suitable for irregular surfaces and complex geometries.
    • Offers versatility in application.
  4. Rubberized Asphalt Membranes:
    • Combines rubber and asphalt for flexibility and durability.
    • Resistant to root penetration, making it suitable for green roofs.
    • Provides superior adhesion to the foundation.

Benefits of Foundation Waterproofing Membranes

  1. Prevents Water Damage:
    • Protects the foundation from water infiltration, preventing structural damage.
  2. Increases Durability:
    • Enhances the lifespan of the building by safeguarding against moisture-related deterioration.
  3. Improves Indoor Air Quality:
    • Reduces the risk of mold and mildew growth, promoting healthier indoor environments.
  4. Cost-Effective Solution:
    • Compared to potential repair costs due to water damage, the installation of a waterproofing membrane is a cost-effective preventive measure.

Installation Process

  1. Surface Preparation:
    • Clean and prepare the foundation surface to ensure proper adhesion.
  2. Application of Membrane:
    • Apply the chosen membrane as per manufacturer guidelines, ensuring full coverage.
  3. Sealing and Overlapping:
    • Seal seams and overlaps securely to create a continuous barrier.
  4. Curing and Inspection:
    • Allow the membrane to cure, and inspect for any imperfections or gaps.
  5. Backfilling:
    • Once the membrane is in place, backfill soil carefully to avoid damage to the membrane.


Foundation waterproofing membranes play a pivotal role in maintaining the structural integrity of buildings. Investing in a quality membrane and ensuring proper installation can provide long-lasting protection against water damage. Consider consulting with a professional waterproofing contractor to determine the most suitable membrane for your specific project.

Remember, a dry foundation is a strong foundation!  we are always here to answer question so call us 516-212-4343