We have had a room refurbished which was previously used as a storage room, but is now a study/spare room. Our house is a flibro/weatherboard, and one of the walls of this very close to the border of our property (within 6 inches). The neighbours land is slightly above floor level of this room (about 3 inches), and he has filled soil up against our wall. Unfortunetly, to the best endevours of our builder who has put blue-board on the exterior wall, sealant, and water-proof paint, water is leaking (seaping) through the soil and into the room after heavy rain. BTW, the room is on a concrete slab.
What would be the best option to keep the water out. Bearing in mind the limited space, and small height difference soil and floor? Ideally making a gap between soil and the wall.