Water stands after rain and ceiling stains recur.
Use the site evidence to agree a project-specific method with the responsible engineer, concrete producer, manufacturer or specialist applicator.
Water stands after rain and ceiling stains recur.
Survey falls with levels; inspect outlets, screed cracks and wet patches during rain.
Blocked outlets, reverse slope or trapped water may overload weak details.
Restore positive drainage and repair discontinuities; select a system compatible with expected movement and exposure.
Dry or condition substrate to product limits; detail outlets and upstands before field application; protect the membrane.
Check falls, membrane continuity and the specified flood or spray test before finishes.
Do not coat over standing water or assume the visible stain is directly below the entry point.
References inform the topic; they do not endorse a specific product for this project.