Drainage & Water Management

In Houston black clay, water is the number-one cause of foundation movement. When soil around the foundation gets saturated, it swells and lifts the slab; when it dries out, it shrinks and the slab drops. The goal of foundation drainage is to keep soil moisture consistent around the entire perimeter of the home. Common solutions include French drains (perforated pipe in a gravel trench), surface drains (grated inlets that catch runoff), grading corrections (re-sloping soil away from the foundation), and root barriers (preventing trees from drawing moisture unevenly). Drainage work is often paired with pier installation but can also stand alone as preventive maintenance. The drainage audit is the most important step — a contractor who walks the property during or shortly after a heavy rain will see the actual water flow patterns and identify the real problems (not just the obvious low spots). Common findings: downspouts that discharge right next to the foundation (a 10-foot extension is the minimum), soil that slopes back toward the house instead of away, low spots in the yard that hold water against the slab edge, and mature trees within 20 feet of the foundation that draw moisture unevenly (one side of the house swells while the other shrinks). Drainage solutions vary in invasiveness: a downspout extension is a one-hour fix; a perimeter French drain is a multi-day project involving a trencher, perforated pipe, gravel, and a connection to a discharge point (street curb or storm drain). Get a written scope that names the components and the discharge point before agreeing to the work.