Class 2 intrusion is defined as “a significant amount of water that breaks through and accessed materials with a medium to high porosity.” In this case, the materials exposed to the ravages of the water will have absorbed more of the water and the water damage process will have lengthened considerably. The mitigation process will be extended as there will be more water to remove and the items potentially contaminated will take longer to dry out. In general, this is caused by things like a ruptured pressurized water line or even a wooden floor joist system that had been flooded. Your class 3 intrusion is known for the large amounts of water associated with it. Regardless of its category, multiple porous items will have absorbed this water and will need a much longer time to dry. This can occur because of a storm leak which can soak through an entire buildings floor and can even appear in the form of broken water mains filing in underground parking areas.
Class 4s are the worst kind of flooding you could experience. Its when water intrudes and is then trapped within by various building materials rendering the flooding extremely damaging. It can take ages to get the water mitigation process completely finished and even longer to drythe area. The affected areas with highly porous materials and is tightly confined requires special equipment and methods to mitigate the liquid properly. This class of intrusion often occurs when stormwater breaks into small enclosures made of wood, plaster and even masonry. At times, this is caused by severe sewage backups that permeate through floor and wall systems in a home.