Problem
Wet patch on the staircase wall under the overhead tank.
- Weeping at the tank plinth
- White salt on the stair soffit
Inspection
Empty-tank visual of floor and wall joints; no thermal scan needed once the weep was visible.
Evidence
Construction joint at the tank floor-wall corner. Overflow pipe was clear.
Diagnosis — Confirmed
Failed tank lining at the floor-wall joint.
Treatment
Surface prep, food-grade epoxy lining. Drilling after lining excluded from warranty.
Testing
Fill test after curing.
Warranty quoted
Quoted 5-year tank lining. Later drilling or impact excluded.
Same method on your building
Book an inspection. You get the diagnostic report before any coating is sold.