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Botany Road Botany

Finished product after injection of the basement

Client: Hutchinson Builders

Location: Botany Road, Botany

Task: Fix massive water leaks to the car park

Andersal Project Manager and Site Supervisors: Jacques Calluaud, Peter Kloots

Principal Sub-Contractor: Remedial Waterproofing Solutions

Special Challenge

  • The work was urgent as the owner could not get an occupancy certificate from council.
  • The waterproofing work around the basement was inadequate or non existent.
  • The complex is in a low lying area of Botany and the basement resembled a swimming pool after heavy rains when Andersal was engaged.

The Solution

The original developer started this project in 1995. It was then on sold partially built to another developer. A number of builders tried to finish the construction but at the end of building the car park had many defects and the certifier wouldn’t issue an occupancy certificate. Hutchinson Builders were engaged to sort out all the problems and they engaged Andersal to fix the water leaks. Basically the basement walls all leaked as did the OSD tank and some of the construction and expansion joints.

Andersal was engaged in June 2011 and decided to repair it by a combination of grout injection to unfilled blockwork walls, chemical injection, epoxy coating, waterproof render and polyurathene joint sealing. This resulted in a dry basement which is a huge relief to Hutchinson and the developer.

Whilst all of the above sounds easy, in actual fact there is a large amount of skill and experience in selecting the correct method for each section of the basement. There are different injection chemicals with different rates of spread and cure. Remedial Waterproofing Solutions have developed their own very high pressure system to inject chemicals and are experts at selecting the best chemical combination for each substrata. The number and spacing of injection nipples has to be determined. When we started we discovered that some of blockwork walls had not been filled so we had to inject with grout.

This is a great example of the effectiveness and cost effectiveness of chemical injection.

The Result

The car park basement area is dry as a bone.