When installing outside draintiles, contractors are notorious for skirting around or over obstructions such as rocks. Also, over time, draintiles may collapse or fill up with silt.
When existing draintiles fail to drain properly, abnormal hydrostatic pressure builds up on the outside of the foundation wall forcing water up through cracks in the floor, where the wall meets the floor, through cold joints, or through blocks or cracked mortar.
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