Leaking concrete of elevator pit floor

• Causes

Water seepage due to waterproofing membrane faulty

• Description of defect

Presence of water or excessive moisture in the elevator pit areas will cause the elevator components to corrode and hence decreasing the equipment. Damaged waterproofing membrane will allow the ground water be penetrated into the pit areas.

Leaking evelavtor pit

• Diagnostic/testing method

Before installation of elevator equipment, the pits shall be tested for waterproofing using tanking, membranes or other positive means and shall have a covered sump (SS:550).

• Good practices

The pit areas should be remained dry at all times and if there is a presence of water, the source of water must be identified and eliminated. The sump cover shall be a non-slip type and durable, and it may be connected into an open-ended drain below sump level to avoid flooding. If there is a case where pump is required, it need to be installed outside the hoistway (SS550).

• Corrections

High pressure grout injection shall be used to stop the water intrusion around the perimeter of the pit. The walls, floors and metal components then shall be painted with prime coat to provide waterproofing for the elevator pits.

Waterproofed elevator pit areas [36]