What aspect does Class 4 in water damage classification consider?

Class 4 in water damage classification specifically considers the water migration speed in dense materials. This classification is relevant for scenarios where water has affected materials that have low permeability and high density, such as hardwood floors, concrete, or brick. In such cases, water can become trapped within these materials due to their dense nature, making drying more complex and slower compared to less dense materials.

Therefore, understanding the water migration speed in these materials is crucial for developing an effective drying strategy. Class 4 situations often require specialized techniques and equipment to facilitate the drying process, as the moisture can be significantly more challenging to remove compared to classes 1, 2, or 3, which involve less dense materials and easier water evaporation.