WHEN TO USE NEGATIVE SIDE WATERPROOFING

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While negative-side waterproofing is not the usual first choice in new construction of foundations, it clearly has its place. It is often selected as the last resort when other options (positive and blind sides) are impractical. Often, negative-side waterproofing is better than re-excavating the entire structure when the original waterproofing materials fail and water is actively leaking.
Using nagetive side waterproofing on this basement walls because we can't excavate the foundation.

When positive-side and blindside waterproofing are applied, water under hydrostatic pressure would not permeate the foundation and the building is expected to remain dry for life. Unfortunately, this is not always the case, and the solution either involves excavating the foundation to conduct repairs or retrofitting the insides of the wall with a negative-side waterproofing application.
Excavating the foundation to apply positive side waterproofing.

Negative-side waterproofing is the application of a coating material to the interior or the ‘dry’ side of a foundation or wall. Its primary function is to create a barrier coat to stop water from leaking through the wall and keeping the space dry.
Applying PROSEAL PROCOAT waterproof coating on the basement walls

Negative-side waterproofing can also help offer a secondary function of providing a decorative surface that offers a value above and beyond a coat of paint. It makes the foundation space more attractive and livable, while serving to keep water out.

Negative-side waterproofing is often used in tunnel projects.
All foundation coatings, including negative-side applications, must be impermeable and withstand hydrostatic pressure, the force exerted in every direction on a foundation. Standing water exerts approximately 3 kPa (0.43 psi) for every foot of water. Consequently, the significant force created by the water will find its way through the foundation wall and into the (formerly) dry space.
Water inside the house as a result of a leaking foundation

Negative-side waterproofing materials typically fall into two categories:

penetrating liquid acrylic waterproofing materials sealing voids and capillary openings where water seeps through; and
cementitious surface coatings providing a secondary cement-based barrier.
Penetrating liquid acrylic waterproofing materials have expanding polymer or crystalline additives as part of their chemistry. On application, these additives expand or grow to block the water-invading pathways. Cementitious surface coatings rely on the applicator to ‘push’ the product into the pathways, and then the product hardens to create a barrier.

Negative-side waterproofing has clear advantages. It can be installed with full visibility and can be easily repaired. It can be applied any time after the substrate material has cured. It can be applied with minimal training and is usually cost effective. Unfortunately, since it is installed from the inside of the structure, the substrate material is not waterproofed, and therefore, unprotected from corrosive soil materials . 

Negative-side waterproofing does have its limitations. It requires secondary assistance when the substrate has cracks larger than 1.5 mm (1/16 in.) or actively flowing water leaks. In these circumstances, PROSEAL ACTIVE STOP is the recommended course of action. ACTIVE STOP is a more modern invention with unique properties and several advantages.
After waterproofing the foundation

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