Internal basement coating blisters while water presses from outside.
Use the site evidence to agree a project-specific method with the responsible engineer, concrete producer, manufacturer or specialist applicator.
Internal basement coating blisters while water presses from outside.
Measure active seepage and salts; check substrate strength and external drainage options.
Water pressure and salts behind an unsuitable coating can break adhesion.
Prefer positive-side treatment where feasible; otherwise design a system rated for negative pressure and treat active paths.
Remove weak coatings, prepare sound mineral substrate and follow the selected system's moisture limits.
Inspect adhesion and monitor after wet weather or groundwater rise.
Do not specify a positive-side-only product for reverse pressure.
References inform the topic; they do not endorse a specific product for this project.