Construction techniques have improved over the years, but homes built prior to 1970's are more likely to have very little water protection. Products such as clay drain tile or corrugated do not stand the test of time or prevent root intrusion as our system products. In a crawlspace, water has nowhere to go but up, thus causing a muddy crawl, a breeding ground for mold and mildew. Our Sub-Floor and Sub-Soil System warranty is transferable in the event you sell your property. This type of ground water problem will not go away and will return when the water table rises.