How to Water Your Foundation in a Central Texas Drought

Why this works at all

• The clay under most of this corridor changes volume with moisture. Wet, it swells. Dry, it shrinks and pulls away from the slab edge, removing support.
• The goal is not to keep the soil wet. It is to keep it CONSISTENT, so the slab is not riding a cycle of expansion and contraction.
• Uneven moisture is the real enemy. A shaded, watered north side and a baking, dry south side is worse than a house that is uniformly dry.
• This is preventative. Watering will not lift a foundation that has already moved - it protects one that hasn't, and it protects a repair after it is done.

A routine that works

• Use a soaker hose, not a sprinkler. You want slow, even delivery into the soil rather than water on the wall.
• Place it roughly a foot to eighteen inches out from the slab, not tight against it. Water pooling directly against the foundation is its own problem.
• Run it all the way around the house, not just the side that looks worst. Even coverage is the entire point.
• Short and frequent beats long and occasional. In a hard drought, a modest run every day or two is far better than a soaking once a week.
• Start before the ground cracks. Once the soil has visibly pulled away and opened fissures, water runs down the gaps instead of soaking in evenly.
• Ease off during and after heavy rain. The aim is steady, not saturated.
• Watch your city's watering restrictions - foundation watering with a soaker hose is commonly treated differently from lawn irrigation, but check rather than assume.

Mistakes that make it worse

• Watering only the side with the visible crack. That increases the unevenness you are trying to eliminate.
• Flooding the soil after a long dry spell. Rapid swelling can be as damaging as the drying was.
• Running a sprinkler against the wall, which soaks siding and brick without doing much for soil moisture at depth.
• Ignoring downspouts while diligently watering. A downspout dumping beside the slab undoes the whole routine at one corner.
• Forgetting that a large tree near the house is drawing serious moisture out of that soil, and will beat a soaker hose.

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