We call them seepage leaks. We receive a multitude of calls when the weather is cold and the heat is on on the inside of homes. It seams that water flows toward the heat, soaks into masonry chimneys and walls and gravity pulls the water down to the points of entry in the building.
These leaks are completely and apart from any roofing issue, but the roofer will get the call. The point of entry always is near a roof juncture. We use the analogy that if you saturate a kitchen sponge and wring it out thoroughly and set it vertically on the counter, water will pond around the sponge on the counter.
This is essentially a valid analogy, but for the element of the heat and the pulling of the water inward. There is something to this effect. The general temperatures of occurrence of this type of leak is where the outside temperature is above freezing and the interior heat is turned on. A soaking rain or even a melting snow can cause this effect.
Sealing masonry is frowned upon by many in the industry, but an answer apart from a sealing of the vertical porous walls, cannot be found. Painting or sealing is the answer that will eliminate the seepage leaks on vertical walls.
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