What is the difference between temporary and permanent excavation pit waterproofing?

Temporary excavation pit waterproofing secures the construction site during the building phase and must act rapidly. Permanent waterproofing is designed for long-term durability and is integrated into the final waterproofing system after construction is complete. RASCOR offers tailored solutions for both requirements.

What materials are used for excavation pit waterproofing?

Polyurethane resins (PU) are used for rapid reaction at water-bearing leakages and immediate sealing. Acrylates (AY) are used for fine structures, high penetration depth and permanent waterproofing. Products include RASCOflex AY408, PU309L, PU309N, PU309S, PU110X and PU516F.

What are the advantages of injection-based excavation pit waterproofing?

Injection-based excavation pit waterproofing enables targeted sealing without extensive dismantling, can be applied under live construction conditions, is effective even under active water ingress and artesian groundwater pressure, and is suitable for both temporary and permanent waterproofing requirements.

Excavation Pit Waterproofing

Products to choose from

Acrylate for curtain injection

PU for large voids including base failure

Foaming PU for cavity filling and consolidation

Elastic PU for sheet pile lock sealing

Foaming PU 1K for localised, temporary sealing

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Waterproofing of excavation pits in case of water ingress

Excavation pit waterproofing is used to quickly and effectively seal water ingress in excavation pits and structural connections. Typical entry points include defects in bored pile walls, sheet pile interlocks, or diaphragm walls – often associated with pressurized groundwater.

In many cases, immediate intervention is required to ensure site safety and prevent consequential damage. RASCOR’s injection systems are specifically designed for these requirements: fast response, reliable performance, and application during ongoing construction operations.

RASCOR offers tailored injection solutions for both temporary and permanent excavation pit waterproofing in building construction, civil engineering, and specialist foundation engineering

When is excavation pit waterproofing used?

Water ingress in excavation pits and structural connections
Leakages in bored pile walls, sheet pile walls, or diaphragm walls
Leaks at anchor heads and penetrations
Acute water ingress under pressurized groundwater conditions
Temporary stabilization during ongoing construction works

How does excavation pit waterproofing work?

Detection: The leakage is precisely identified.
Injection: The injection material is applied directly into the leak.
Reaction: Depending on the system, it reacts immediately with water, expands, or penetrates fine structures.
Waterproofing: Leaks are closed, voids are filled, and water ingress is stopped.

Which materials are used?

Polyurethane resins (PU309L, PU309N, PU309S, PU309F, PU110X, PU516F) – for rapid reaction in cases of active water ingress and immediate waterproofing under pressure
Acrylates (AY408) – for fine structures, high penetration depth, and permanent waterproofing

Can excavation pit waterproofing be carried out during ongoing operations?

Yes. Rascor’s injection systems are designed for use under active construction site conditions. They perform reliably even in cases of active water ingress and under water pressure – enabling fast waterproofing without interrupting construction activities. This is particularly important for projects in urban environments or with tight schedules.

What are the advantages of excavation pit waterproofing?

Fast response in case of active water ingress
Suitable for use during ongoing construction operations
Temporary and permanent waterproofing solutions available
Suitable for bored pile walls, sheet piles, and diaphragm walls
No need for large-scale dismantling work

Typical applications

excavation pits in building and civil engineering
secant pile walls and sheet pile walls
diaphragm walls
anchor heads and penetrations

Consulting and support

RASCOR has been developing and delivering specialised injection and stabilisation solutions for infrastructure and construction projects worldwide for decades. Our systems are used by construction companies, infrastructure operators and engineers who require reliable, long-lasting waterproofing solutions.

We support you in selecting the right system – tailored to your application, requirements and project conditions.