Basement Waterproofing in Sydney

What balcony waterproofing in Sydney actually involves

A balcony sheds water. A basement is surrounded by it. The wall below ground is under pressure from saturated soil, and the answer is a system rather than a coating: tanking on the outer face, a drainage sheet to give water somewhere to go, and a drain at the footing to take it away before it builds up against the structure.

What a basement system involves

This is why a basement that has been dry for years can start seeping after a wet autumn — nothing about the wall changed, the water table did. It is also why repairs applied from the inside are a holding measure at best: they resist the symptom while the pressure that caused it stays where it was. The three parts are not optional extras to one another either. Tanking with no drainage sheet gives water nowhere to travel, and a drainage sheet with no drain at the footing simply delivers it to the bottom of the wall and leaves it there.

Sydney's rainfall arrives in sustained autumn and early-winter runs, peaking in March and June and falling away to a September low, so ground water loads follow the same curve rather than spiking with individual storms. A basement problem here tends to present as a season rather than as an event. Source: Bureau of Meteorology climate statistics, Sydney (Observatory Hill) station 066062 and Sydney Airport station 066037.

Basement Waterproofing in Sydney — common questions

Can a basement be waterproofed from the inside?

Internal treatments manage water that is already coming through. They do not remove the pressure outside the wall, which is why external tanking and drainage is the durable answer where it can be reached.

Why has my basement only started leaking now?

Ground water is seasonal. A wall that copes through dry years can be overwhelmed when sustained rain raises the water table against it.

Does the ground have to be excavated?

For external tanking, yes — the outer face of the wall has to be reachable. Where that is impossible, the options narrow to internal systems and drainage management.