Usually because the source was never fixed, only the stain was painted over. We trace the actual water path and seal that, with proper surface prep.
Terraces, roofs, bathrooms, balconies, water tanks, sunken areas and external walls, each with a system suited to that surface.
Where the area allows, we run a ponding or moisture test after curing so you can see the seal holds before we hand over.
A correctly applied system lasts many years. Life depends on the surface, movement and usage, which we explain up front.
Yes, eligible waterproofing carries a written warranty against seepage under normal conditions.