case 1 - cracked masonry walls and water entry… many of these units had drains installed in the basement floor just inside the walls (ahhhhhem) and all were ineffective or worsened the problems…
case 3. interior drain causes damage, home had wet basement, mold… a ‘waterproofing’ (ahhhem) company installed an interior drain around around the full basement floor… excavation of the slab and earth for said interior drain increased the unbalanced fill height n cut into the existing walls, which worsened interior and exterior wall cracks. Water continued to enter through the block walls increasing mold…