Sewer Inspections reveal the desperate condition of many sewer systems which are over 25 years old. These systems consist of a host of different materials including clay, orangeburg, terracotta and cast iron, to name just a few. All of these materials are subject to degradation. Root infiltration and faulty joints being the most damaging issues. When buying or selling a house you should know the condition of your sewers just like you would the roof, foundation or dry rot condition.