Lift Pit & Lift Shaft Waterproofing

Lift pits often extend below the surrounding slab, where groundwater can put pressure on the walls and floor. Wall-to-floor junctions, construction joints and service penetrations all need careful detailing to maintain a continuous waterproofing barrier.

The right system depends on where the water is coming from, the condition of the concrete and which side of the structure can be treated.

Elastoseal HD for lift pits

Crommelin Elastoseal HD is a heavy-duty, water-based tanking membrane for critical waterproofing in areas protected from UV exposure, including below-ground lift pits.

It forms a seamless, flexible membrane designed for ponding and permanent water immersion. Its flexibility allows it to accommodate structural movement.

Tips for a dry lift pit

• Prepare the concrete. Remove laitance, release agents and loose material. Repair voids and honeycombing, and follow the specified moisture and priming requirements.
• Detail junctions and penetrations. Pay particular attention to wall-to-floor and wall-to-wall junctions, construction joints, service penetrations and any sump. Follow the project specification for bond breaking, sealing and reinforcement.
• Check the membrane before it is covered. Follow the specified coverage, thickness and curing requirements. Inspect the finished membrane and protect it from damage during subsequent work.

Every lift pit is different. Our technical team can help with product selection and specifications for your project. Call our 7 day helpline on 1800 655 711.

Frequently Asked Questions

Why do lift pits leak?
Lift pits are the lowest part of the building, so groundwater and surface water collect around them. Leaks usually come through the wall-to-floor junction, construction joints and penetrations.

Can a lift pit be waterproofed from the inside?
Yes, in some situations. When the outside of the pit cannot be reached, a negative side waterproofing system can be applied to the inside face. Talk to our technical team to confirm the right approach.

Is Elastoseal HD suitable for other below-ground areas?
Yes. It is also used for basements, retaining walls, planter boxes and other non-exposed areas that are in constant contact with water.