Why Wind-Driven Rain Can Enter Without Missing Roofing Material
After a storm, homeowners typically check for missing shingles, broken tiles, or visible holes. If none are present, water intrusion may seem unlikely. However, strong winds can drive rain into small openings that remain dry during normal rainfall.
Roofing systems are designed to direct water downward. In calm rain, gravity moves water over tiles, shingles, flashing, and other components toward the roof edge. Wind-driven rain behaves differently. Gusts can force water sideways or upward, allowing it to reach beneath overlapping materials and into roof transitions.
Vulnerable areas include roof edges, ridges, valleys, vents, skylights, pipe penetrations, and where the roof meets exterior walls. Loosened or deteriorated flashing or sealant may only allow water entry when rain comes from a specific direction. Small gaps can go unnoticed in normal weather but become entry points during storms.
Tile roofs illustrate this issue well. While tiles are the visible covering, they are not the only defense against water. Wind can drive rain beneath intact tiles, relying on the underlayment to protect the roof deck. If the underlayment is aged, punctured, improperly installed, or deteriorated around penetrations, water can reach the structure even if no tile is missing.
Wind can also lift roofing materials slightly without dislodging them. Shingles, tiles, flashing edges, or ridge components may shift during a gust and settle back afterward. From the ground, the roof may look unchanged, but its seal or attachment could be compromised.
Inside the home, look for ceiling stains, damp insulation, peeling paint, or leaks that occur only when rain comes from a certain direction. Water can travel along decking or framing, so visible stains may be far from the entry point.
Do not walk on the roof to search for the problem. Packard Roofing & Waterproofing, Inc. can help Treasure Coast homeowners investigate wind-driven rain intrusion and identify the source of water entry.
