Wind Driven Rain | Home Inspections Seattle-Bellevue-Everett

Home Inspector with Hergert Inspection LLC

Wind Driven Rain | Home Inspections Seattle-Bellevue-Everett

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Possible Wind Driven Rain

The upper corner of the floor 2 bedroom showed evidence of moisture. An infrared image shows evidence that moisture has traveled as much as 3' down the wall.

wind driven rain

There was no evidence of a roof leak visible inside the attic or any damage to the roofing. To see the exact area of the roof leak would require a temporary work platform in the attic and removal of insulation.

The location of the leak is near dead center of this home which is located in a very windy area of Seattle, Everett, and Bellevue. It is possible that the rain is being pushed/ drawn into the bird block vents at the center of the house due to the design, site placement and exposure to the wind

The most probable cause is wind driven rain entering thru the bird blocks. Once verified that wind driven rain is the cause of the moisture, I recommended the following as a possible remedy to the problem;  As closing the vent holes may just shift the problem to adjacent blocks, I recommend that they install PVC pipe extensions of the vents into the attic. Increasing the pipe size should reduce the wind velocity. The rain water should fall onto the pipe and then roll back out to the exterior.




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Kevin Hergert

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