Roof Leak Wind Driven Rain

Wind driven rain can also be a major problem.

Roof leak wind driven rain.

Wind driven rain will penetrate the cracks between the door and jamb and in many cases wet the floor. Wind driven rain will batter your roof and water will escape through any cracks no matter how small they are. Hairline cracks in tiles or splits as they are sometimes called cause leaks too. An exterior door facing the north with little roof overhang is a prime candidate to leak.

The most common reasons why roofs only leak during heavy rain are. If your roof vent leaks during heavy rain the rain may be blowing up under the hood and into the vent. However this is not entirely the case since there are leaks that can be caused by a mixture of wind and rain that are called wind driven rain. It this is the case you need to create a breathable shield to slow the driving rain drops while still allowing air flow.

Wind blown rain leaks. Wind driven rain can cause a problem and very difficult to fix. Hemming the roof edges. In that path it passes vents on the roof.

This will stop the rain getting under and causing roof leaking by wind driven rains. Roof vents can let hurricane driven rain into an attic because most vents are not designed to resist hurricane forcefully driven rain. And on occasion a hard driving rain with whipping wind will cause roof vents to leak water. No sarking to catch leaks driven in by heavy rain leaking low pitched tile roofs with sarking heavy rain and blockage causing the valleys to overflow.

The membranes won t stop the ice but will stop water leaks if installed properly. Often a roof can be in perfect condition but because the wind drives the rain across and upwards it can get under the eave and under the roof. In other words water may not flow down to eaves on the windward side but instead can be driven up the roof to the peak. Cracks in roof tiles need not be huge to cause a significant leak.

Further during a hurricane wind can blow rain water up the roof in sheets. Yes water can flow uphill when blown by wind. The only means of prevention is to install membranes under the roofing.