Storm Rain Entering Through Roof Vents

Through the roof penetrations like attic vents can blow off in high winds providing a hole for water entry.

Storm rain entering through roof vents.

Another approach is to place filter. To avoid water entry at soffit vents options include eliminat ing soffit vents and providing an alternate method for air to enter the attic or design for an unvented attic. Typically as long as there is a window screen covering the exhaust vent pipe and there is a roof overhang rain water will get deflected by the screen and roof overhang and not be an issue getting inside the exhaust vent ducting. These vents are designed to not allow water to enter when it is coming down at normal angles.

For wind driven rain to enter attics through soffit vent openings such as those shown in figure 6. To avoid water entry at soffit vents options include eliminating soffit vents and providing an alternate method for air to enter the attic or design for an unventilated attic. Select soffit vents with perforations that are concentrated near the outer edge to minimize the area that wind driven rain can enter. The roof vent pipe is installed cut through the roof and around the pipe attached to the roof is surrounded with rubber boot as insulation for the gap between the pipe and roof.

Another approach is to place filter fabric like that. However high winds causing rain to move in horizontally can sometimes penetrate their defenses. However follow the manufacturer s recommendation for sealing around the window frame and moveable sliding window. During a rain storm winds may blow rain into your home through the attic vents.

Baffled ridge vents prevent airflow and wind driven rain from entering the attic through the ridge vent. This added moisture causes wood damage fuels the growth of mold and mildew and may destroy stored items. Protection from wind driven rain if you live in an area which is highly susceptible to hurricanes it would be wise to invest in storm guards. Roof vents can let hurricane driven rain into an attic because most vents are not designed to resist hurricane forcefully driven rain.

Remove debris make sure your roof valleys are clear of debris re shingle valleys valleys may need to be reshingled with new ice and water shield put in place. Yes water can flow uphill when blown by wind.