Concrete block vs poured concrete doesn't matter. All concrete is porous. It is strong but not waterproof. The paint or other applied coatings, caulks, and sealers provide the waterproofing. I had a crack in the stucco above one window and it leaked. I chipped away the old stucco which came off quite easily due to the water seeping underneath. Reapplied stucco and 2 coats of paint and no problems since.
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