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Sirs,
Greetings.
Please explain or suggest the best proven method to waterproof a basement retaining wall.

Thanks.

If you still haven't completed the building, the best way to waterproof small sites, is to plaster outside like sump walls, after a day, start filling soil back.
If in case, it is an existing building and can't dig out soil, nothing much can be done apart from injection technique. refer link below
https://www.youtube.com/watch?v=eEXAWukRfD4

Another idea is to provide drain pipe for retaining wall, either back fill or inside. Usually inside is possible in residential areas.
Thanks,
Bharath

Thank you Bharat sir.

Fosroc Proofex Engage has been specifically engineered for pre-applied applications. Proofex Engage developed and patented by Fosroc is a unique system comprising a complex cell mesh bonded to a polyethylene membrane, which allows poured concrete to interlock with the membrane forming a tenacious mechanical bond preventing water migration in case accidental damage occur. Proofex Engage is supplied with a selvedge on one side to provide sealed laps.Proofex Engage membranes are loose laid over compacted soil or secured vertically against formwork or diaphragm walls before the concrete is poured. Comprised a tough, durable HDPE film of 4 to 5mm thick Proofex Engage can be installed quickly and is ready for immediate placing of rebar and concrete without further protection.

Hi

can you please share number of dealer or installer of
Fosroc Proofex Engage in Bangalore ?

Regards

Use integral water proofing, gives you 10% additional structural strength too..