Horizontal cracks in your outside foundation stem wall? This could be a serious problem. Usually these horizontal cracks are a result of the rebar oxidizing. When rebar rusts it grows in volume putting pressure on concrete, at first cracking it and given enough time will fallow the rebar all the way around the stem wall, causing water to inter the interior cement slab. This is caused by chloride ion exchange in the moisture laden pores.
Slab Cracks
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