Most floods are caused by exterior structural damage so why would you need to waterproof your basement from the inside?
The cost of basement waterproofing can be as little as a few hundred dollars or can be several thousand. Interior waterproofing is also much less invasive. Homeowners in flood-prone areas should take preventative measures to protect their home, but often choose to take minimum measures against leaks. When there are major obstacles that prevent exterior waterproofing. For example, houses are too close to each other which won’t allow for excavating.