Confirmed
Multiple evidence points support the cause.
What you are seeing
Symptoms and likely causes
Typical signs
- Drips or wet patches on the slab soffit, not only peeling paint
- A crack that weeps during rain or when the tank above is full
- Previous surface waterproofing that the leak ignored
- Damp that tracks along the underside of the slab away from any one stain
Causes we actually check
- Construction joints that were never detailed
- Through-cracks from thermal movement or settlement
- Pipe or HVAC penetrations through the slab
- Failed membrane on the topside letting water into the mass of the slab
How Gracia diagnoses
Evidence before treatment
We inspect both faces of the slab when we can. Injection is for live through-cracks; a membrane is for the field. Thermal helps when the weep is offset. A coat on the dry soffit is not a slab repair we will warrant.
HITEC City commercial roofs and older Chinthal houses both show untreated joints under a later coat. The Gachibowli basement and HITEC polyurea cases are this class of problem: joints first, then the system.
Probable
Evidence indicates the cause; further verification may still be required.
Possible
One or more clues exist, but the evidence is not enough for a firm conclusion.
Excluded
Inspected, and no supporting evidence found in the inspected area.
What the Leak Diagnostic Report contains → · Thermal diagnosis cluster
Local case
HITEC City commercial roof — polyurea system
Problem. Repeated monsoon leaks into a commercial top floor despite two previous coatings.
Evidence. Failures clustered at HVAC kerbs and expansion joints, not the field of the old coat.
Confirmed. Untreated penetrations and joints under a coating that had been applied over them.
Treatment. Joint and kerb detailing, then specified polyurea system.
Testing. Pond test on bays that hold water; leak watch on the floor below.
Full case study →Questions
About this problem
If water is coming through a crack or joint, not just staining the ceiling after ponding, it is a slab path. We check the topside membrane and the joint. Injection and coating are different line items on the quote.
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