Watermark on exterior wall. What could be the cause?

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Posted by: from Vaughan
4/3/2017 at 3:36:23 PM

This watermark has appeared near my kitchen vent's exterior. It is between the kitchen and the master bedroom on the second floor. However, there is no water pipe around the area of the water mark, and, no air leak from the kitchen vent pipe.

Does anyone know why this watermark could have appeared in this area even when there is no water leak?

Watermark on exterior wall. What could be the cause?
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Date/Time4/3/2017 at 4:14:16 PM

It could be the vent is not hooked up correctly inside and causing moisture to go in between the brick and the house.

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Date/Time4/3/2017 at 4:39:47 PM

It could be your windows. Rain water coming in behind the windows

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David in Vaughan
Date/Time4/3/2017 at 10:42:56 PM

I think I have found the cause. There is a large gap around kitchen vent's pipe which caused air leakage during the winter time. I heard from multiple sources say that it could lead to condensation inside wall. I've filled it with gap filler and hopefully it could solve my problem.

Two pictures attached. One is taken before fix and another one is taken after fix.

Thank you Collin and Rodney.


Watermark on exterior wall. What could be the cause?

Watermark on exterior wall. What could be the cause?

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