Negative waterproofing in “ Gilboa Pumped Storage “

Project Description

A complex sealing project of levels and power turbine halls at Gilboa Pumped Storage power plant
In this project, a three-layer sealing system was “sewn” for the first time to provide a solution for water penetration in varying pressures through walls of placed concrete against rock, shotcrete walls, wall to floor joints and placed concrete floors on soil and rock grade.
The system includes bonding of three different layers: a Penetron crystalline sealing system, dual-component hybrid cementitious membrane layers and at the end, application of a heated polyurea membrane for rapid commissioning of the facility.


  1. Work in an operating facility in advanced delivery stages
  2. Joining three different sealing systems for maximal results
  3. Difficulty in preparing proper base due to low concrete quality
  4. Application of a polyurea system under varying humidity conditions while using heating systems to change the facility’s climate
  5. Meeting tight deadlines while working shifts


  1. Initial testing series to evaluate the systems
  2. Detecting rock leakage areas in the rock and installing temporary drain channels
  3. Preparation of concrete walls and floors including roughening to CSP2 grade
  4. Preparation of anchorage baths by slotting and excavation at wall-floor joints
  5. Angular drilling in floor-wall joints for installation of crystalline bond spouts
  6. Application by impregnation of crystalline sealing layers on concrete base and walls, including waiting 21 days for the material to penetrate
  7. Installation of sloped concrete and excavation of leading channels
  8. Implementation of MB2K dual-component hybrid cementitious sealing membrane
  9. Application of heated polyurea sealing membrane containing R12 anti-slip additive
  10. Completing decorative finish in a breathing plaster system
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