Hosmer Drainage and Foundation can determine the root cause of your basement leaks, flooding or humidity problems and suggest the most efficient course of action to waterproof the area. Draw on the experience of our chief foundation inspector Tim Hosmer. Tim will diagnose the source of water penetration into the basement or crawlspace, he will then recommend a course of action to resolve the basement leak or moisture problem permanently. Call (205) 834-2708 to set up your free inspection and estimate. Clay Bowl, Basement Waterproofers Birmingham, AL Illustration of the Clay Bowl Effect. Finished basements, crawl spaces, and even ground level floors are commonly affected by water leaks and drainage issues in Alabama. There is a layer of nearly pure clay just inches under the surface on most properties. This clay acts like a container, any low areas will hold water just like a pond…slowly draining into the soil and evaporating during a period that can last days. This problem is exacerbated in a situation where a homes subfloor was dug out and backfilled. This backfilled dirt will always be far more porous than the surrounding areas. This gives the water a path of least resistance in the worst place possible, straight down and around your entire basement/subfloor.