waterproof foundation

The hallway subfloor seems to get damp, especially if it's been raining heavily outside. Do you think it would be a sensible solution to apply slurry to this floor, and the walls below the floorboard level to prevent this? I don't want to make a mistake before putting the floorboards back down...

Can anyone help please? Water slowly seeping through base of 200 year old terrace house into the basement ceiling over several years. Rogue builder tried repairing by just putting in cement/sand in places a couple years ago. Leaks continued in various places and affecting where basement wall...

what is the general consensus on applying a waterproof render on the foundation of a (victorian terraced) house? Background: frontroom is damp (water pooling on the bare ground below floor level, plaster in walls close the the water pool is blown). We are in the process of digging away clay-ish...