Basements
Controls seepage through retaining and perimeter walls in below-grade slabs.
Internal/Negative Waterproofing Systems
Designed for areas where external access isn't viable, these systems resist hydrostatic pressure from within the structure.
Negative-side waterproofing is ideal when excavation or external membrane replacement is impractical. We design internal systems that control active ingress and extend the service life of below-ground and enclosed assets.
What Is Internal/Negative Waterproofing?
Negative waterproofing is applied on the dry or internal side of a structure to resist moisture that has already penetrated the substrate.
It is commonly used in basements and below-grade structures where exterior remediation is restricted by access, adjoining properties, or operational constraints.
Common Applications
Internal systems designed for high-risk, access-restricted assets.
Lift Pits
Protects critical lift infrastructure from persistent dampness and active leaks.
Underground Plant Rooms
Reduces moisture migration around mechanical and electrical assets.
Carparks
Manages ingress in podium undersides and enclosed parking structures.
Retaining Walls
Internal barriers that resist hydrostatic pressure from surrounding soils.
System Types
Material selections are matched to pressure conditions, substrate condition, and leak profile.
Crystalline Cementitious Slurries
- Penetrates concrete capillaries to block moisture pathways
- Suitable for internal tanking systems in concrete structures
Flexible Cementitious Coatings
- Bridges minor substrate movement and hairline cracking
- Designed for damp walls, pits, and enclosed service spaces
Reactive Internal Sealants
- Targets active leak paths at joints, cracks, and penetrations
- Rapid-response treatment for high-pressure ingress points
Delivery Process
Every internal remediation scope is sequenced to stabilise leaks quickly and verify performance.
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1
Substrate Cleaning
Preparation removes contaminants and exposes active ingress paths.
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2
Leak Tracking
We diagnose crack lines, joints, and pressure points before treatment.
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3
Customised Internal Coating
Selected systems are applied to suit moisture levels and structural movement.
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4
Pressure Resistance Test
Validation confirms the system is stable under hydrostatic load.
Why Choose Negative Waterproofing?
A practical solution for asset protection when external remediation is not possible.
No External Access Required
Delivers remediation where excavation or facade access is constrained.
Fast Mobilisation
Internal works can be staged quickly in live, occupied buildings.
Pressure-Resistant Performance
Formulated to withstand sustained moisture and hydrostatic pressure.
Live-Site Compatible
Suitable for staged delivery in operational basements and plant areas.