Visible signs of water damage: Look for any visible signs of water stains, dampness, or discoloration on walls, ceilings, or floors. These signs can manifest as dark patches, peeling paint or wallpaper, or even sagging or bulging areas. It's important to pay attention to areas near windows, roofs, pipes, and plumbing fixtures, as these are common entry points for water. Additionally, check for water rings or marks on furniture or carpets, as they may indicate water leakage from above. These visible signs of water damage suggest that water is infiltrating the building and warrant further investigation for potential waterproofing needs.