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An Efficient Approach to Elevator Piston Housing Waterproofing

When requested to provide waterproofing specifications for an elevator pit in a low-rise commercial building on Bathurst St. in North York, Tenera conducted a thorough site examination, to determine the full scope of work required to waterproof this shaft that contained a piston-operated elevator. Special care must be taken to waterproof around the piston housing to ensure lasting results.

Based on this assessment, we provided the client and overseeing contractor with a tailored application design.

Halting Active Leaks

Our instructions to the contractor included the application of polymer cement to the affected area, followed by accelerating the curing process by using a torch. Subsequently, an adhesive coating was applied and dried with a torch before the installation of a waterproofing membrane layer. This procedure provides the ability to continue with the waterproofing application by stopping the waterflow and enhancing the overall effectiveness and durability of the waterproofing solution.

Repairing Cracks

Addressing cracks demands a methodical approach. Contractors were tasked with opening up cracks to remove loose debris to enhance adhesion for subsequent materials. After applying industrial-strength adhesive, specialized crack-filling material was utilised to seal and fill the cracks, restoring slab integrity and preventing further degradation. This systematic process ensures thorough and enduring crack repair, ensuring the treated surface's durability and stability.

Waterproofing Cold Joints

Cold joint waterproofing is crucial for maintaining the structural integrity of concrete structures. The process involves meticulous cleaning of joints to eliminate debris hindering adhesion. Subsequently, joints are coated with adhesive to enhance bonding before a continuous patch is installed at a 45-degree angle, reinforcing and stabilising the joint. To further bolster the repair and prevent future water infiltration, a fiberglass membrane is applied over the joint, with an upturn on the surrounding wall. This comprehensive approach effectively seals the cold joint, minimising the risk of water infiltration and enhancing structural durability.

Piston Housing Waterproofing

Our specialised repair procedure offers a robust waterproofing solution. Initially, any accumulated water is pumped out of the piston housing, and thorough cleaning is conducted. Subsequently, a polyurea-based foam is injected, followed by the application of primer onto the walls of the piston housing and the use of a specialised waterproofing filler. Proceeding with the installation, an industrial-strength adhesive is employed to ensure the proper adherence of a two-inch concrete layer. Finally, the newly laid concrete is coated with a sealing primer, effectively sealing around the piston housing.

Installation of Membrane

As the final step in elevator pit waterproofing, a polyaspartic waterproofing membrane is meticulously installed according to specifications. Applied over the elevator pit floor with an upturn on the wall around the shaft perimeter, covering the fiberglass layer. This membrane provides a robust solution for waterproofing and safeguarding the elevator shaft environment. Its seamless and durable barrier effectively seals the floor and walls, preventing water infiltration and corrosion in demanding elevator shaft conditions. Its rapid curing properties allow quick installation and minimal downtime, ensuring a swift return to service.

By integrating polyaspartic membranes, elevator shafts benefit from enhanced durability, reduced maintenance needs, and prolonged service life, ultimately enhancing the overall safety and reliability of the elevator system.

For further insights into our elevator pit waterproofing solutions, please visit our website:


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