I have a home where a portion of a lower roof is against a stucco wall. I had the roof replaced 5 years ago and just in the past 6 months had two problems with a water leak. The water not only leaked into the room directly below the roof but also into the living room which is under a different roof but shares the same ajoining stucco wall.
The water also traveled all the way down the same wall and stained the basement ceiling.
My roofer inspected the roof and caulked along the stucco where the shingles meet the stucco as he thought the force of the driving rain may have some how gotten under the flashing.
My roofer suggested that I waterproof the stucco walls as a precaution because he felt water may be getting into the wall during a driving rain. Is this possible? I assummed that the stucco was designed to get wet during and would never have water penetrate it but I don't know much about how stucco is designed.