Class 3 water intrusion is where moisture has wicked up the walls more than 24 inches, water may have come from above and/or wet insulation may be present and there is more water present than any other class. Class 3 water losses include:
- Strong wins damage the roof and rain enters from above, saturating ceilings, walls, flooring materials and structural items.
- Second floor water supply failure saturates entire areas below with large amounts of water.
- Overhead water supply pipes malfunction, saturating entire areas with large amounts of water.
A Class 4 water intrusion results in a specialty drying situation. Typically, wet materials present in a Class 4 water situation have very low porosity. Materials that are common to Class 4 intrusions include hardwood, plaster, brick, deeply saturated concrete, deeply saturated ground soil and stone. Other examples of Class 4 situations include:
- Plaster and lath walls that are deeply saturated
- Gymnasium floors
- Hardwood floors in residential construction
- Very old construction with multiple layers of building materials
- Dirt floors
Use of desiccant and/or LGR dehumidifiers is necessary in Class 4 situations.