Case Study: Bathroom Waterproofing in Koramangala, Bangalore

The Problem

A 4th-floor flat owner in an HSR Layout-adjacent Koramangala apartment received a legal notice from the 3rd-floor flat below: their bathroom had been leaking for 8 months, causing damp patches on the neighbour's ceiling and damaging their freshly painted walls. The 4th-floor owner's bathroom tiles were 3 years old and in perfect condition — they were understandably reluctant to break them.

Our Diagnosis

Water seepage through the bathroom floor was occurring at tile grout joints rather than through the tiles themselves. Grouted joints had developed micro-cracks from thermal cycling and cleaning chemical exposure. No need to break tiles — the grout line itself was the entry point.

The Solution

PU injection grouting into all floor tile joints using a pressure injection system. Fosroc Thioflex sealant applied into wall-floor junction. Dr. Fixit Pidicrete brushed onto all exposed concrete areas (behind toilet, under basin). No tiles broken. Total work time: 6 hours.

The Result

What This Job Cost — And Why

The total cost of ₹14,500 for this job breaks down as: 35–40% materials, 25–30% surface preparation and labour, 10–15% mobilisation and equipment. This is higher than the cheapest quotes the customer received — but it produced a permanent fix where two previous cheaper jobs had failed completely.

The framework for evaluating any waterproofing quote isn't price per sqft. It's: What is the contractor's diagnosis of the root cause? What preparation will they do? What material and how many coats? What does the written warranty cover? Get those four answers in writing before comparing quotes.