Basements can be a real source of grief for the homeowner. Holes and cracks in the basement walls and floors allow water and even ultra-nasty sewage to seep into the basement. This can subject the home to major health risks from debilitating mold, not to mention the offensive nose-bombs.
You can't let this situation go on -- it'll just get worse and worse, and compromise the integrity of your home's foundation. So, what's the first step to getting a grip on this situation? To nip this situation in the bud, and prior to even thinking about waterproofing, you need to thoroughly understand what causes cracks in the basement floor.