Storm Rain Entering Through Roof Vents

During a rain storm winds may blow rain into your home through the attic vents.

Storm rain entering through roof vents.

If the rain comes in at an angle then i guess it s possible rain can get through the vent holes and into the roof space. If your roof vent leaks during heavy rain the rain may be blowing up under the hood and into the vent. Minimizing water intrusion through roof vents in high wind regionshttp www fema gov the unventilated attic the most conservative approach to preventing wind driven rain from entering the attic is to eliminate attic ventilation but unventilated attics are controversial. Yes water can flow uphill when blown by wind.

Roof vents can let hurricane driven rain into an attic because most vents are not designed to resist hurricane forcefully driven rain. Wind driven rain penetration currently there is no ade quate standard test method to evaluate the potential for wind driven rain to enter attics through soffit vent openings such as those shown in figure 6. This video shows one possible way to do that. This added moisture causes wood damage fuels the growth of mold and mildew and may destroy stored items.