Waterproofing is an essential component of construction and building maintenance. It helps protect structures from water damage, which can cause structural problems, mold growth, and other issues. There are different types of waterproofing, and negative-side waterproofing is one of them.
In this article, we'll discuss the negative side of waterproofing, its benefits, the materials used, and how it differs from the positive side of waterproofing.

Negative Side Waterproofing?

Negative side waterproofing refers to the inside of a structure's foundation, walls, or floors. It's called the "negative side" because it's done on the side of the structure opposite to the side exposed to water. Negative side waterproofing is typically done when it's not possible or practical to access the exterior side of the structure to apply positive side waterproofing.

Negative side waterproofing is a method of last resort because it's often more difficult and expensive to apply than positive side waterproofing. However, it's necessary when the structure's foundation is below the water table or when there's no way to access the exterior side of the structure.

Benefits of Negative Side Waterproofing

Negative side waterproofing has several benefits, including:

Prevents Water Intrusion

Negative side waterproofing prevents water from seeping into the structure through the walls or foundation. This helps prevent damage to the structure and keeps it dry and structurally sound.


In some cases, negative-side waterproofing can be more cost-effective than positive-side waterproofing because it doesn't require excavation or other expensive measures.

Lasting Protection

When done correctly, negative-side waterproofing can provide long-lasting protection against water intrusion.

Materials Used for Negative Side Waterproofing

There are several materials used for negative-side waterproofing, including:

Cementitious Coatings

Cementitious coatings are a popular choice for negative-side waterproofing because they're easy to apply and can effectively prevent water intrusion. They're typically applied to the surface of the walls or foundation using a brush or roller.

Crystalline Waterproofing

Crystalline waterproofing is a type of waterproofing that involves applying a crystalline material to the surface of the walls or foundation. The material reacts with the water in the concrete to create crystals that fill in any cracks or gaps and prevent water from seeping in.

Injection Grouting

Injection grouting involves injecting a waterproofing material into the cracks or gaps in the walls or foundation to prevent water intrusion. This method is typically used for small cracks or gaps.

Positive Side vs. Negative Side Waterproofing

Positive side waterproofing is applied to the exterior side of the structure, while negative side waterproofing is applied to the interior side. Positive-side waterproofing is typically preferred because it's more effective and easier to apply. However, negative side waterproofing is necessary for situations where positive waterproofing is impossible.


Negative side waterproofing is an essential aspect of building maintenance and construction. It's a method of last resort when it comes to waterproofing, but it's necessary when there's no other way to prevent water intrusion. By understanding the negative side of waterproofing, its benefits, and the materials used, you can make an informed decision about whether it's the right choice for your structure.

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