Oct 16 2025
Dampproofing vs Waterproofing: Understanding Foundation Protection
Below Grade Moisture Control: Dampproofing vs Waterproofing

Understanding the Difference Between Dampproofing and Waterproofing

Did you know that there are different ways to protect foundations depending on water presence and hydrostatic pressure?

There is a distinct difference between Dampproofing and Waterproofing for below-grade foundations. Dampproofing is used only when the foundation needs protection from soil moisture and is not under hydrostatic pressure. However, when your foundation has high water levels or pressures, foundations are susceptible to water infiltration by hydrostatic pressure. When this condition occurs, we need to use a Waterproofing product as our solution to withstand this hydrostatic pressure.

 

Dampproofing Applications

Dampproofing is typically fluid-applied coatings that come in many material types. They are applied to the entire exterior face of the below-grade foundation. Include a protection board or a combination of drainage plain and insulation over the dampproofing to prevent damage.

Waterproofing Applications

Waterproofing is typically a form of a membrane (either fluid or sheet applied), from a variety of material compositions, creating a continuous and complete waterproof barrier. Maintaining a constant barrier protecting the foundation is critical, as any infiltration can cause long-term structural damage. Include a protection board or a combination of drainage plain and insulation over the waterproofing to prevent damage.

Comparison: Dampproofing vs Waterproofing

Dampproofing vs Waterproofing for foundation protection

Consulting with Engineers and Product Experts

Always consult geo-technical engineers and their reports to determine soil types and water presence. With this information, you can work together with building enclosure consultants and product manufacturers to assess whether Dampproofing or Waterproofing is the best solution for your project.

Best Practices for Choosing the Right Foundation Protection Method

Understanding dampproofing vs waterproofing helps ensure your foundation design is durable, code-compliant, and responsive to site-specific conditions. Selecting the correct system prevents water infiltration and protects the structure’s integrity for the long term.

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Written by D.TO: Design TOgether

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