The short answer
Pier and beam homes sit above the ground, so standing water doesn't reach the floor right away, but it can rot wood, invite pests and grow mold under the house. Slab homes sit on the ground, so water near the house can get in faster, and wet-then-dry clay soil can crack the slab. Both need the ground to slope away and downspouts that empty far from the house.
Pier and beam: what to watch
- Water or a musty smell under the house after rain.
- Soft, bouncy or sloping floors.
- Blocked or missing vents in the crawlspace skirting.
Slab: what to watch
- New cracks in the slab, walls or brick, or doors that start to stick.
- Water coming in at the bottom of walls after heavy rain.
- Gaps opening between the slab and the soil in dry spells.
What helps both
- Ground that slopes away from the house.
- Gutters and downspouts that move water several feet away.
- Keeping soil moisture steady near the foundation, so clay doesn't swell and shrink as much.
Questions people ask
- Is pier and beam better in flood areas?
- Raising a home helps keep floodwater off the floor, which is why many older Louisiana homes were built that way. It still needs good drainage underneath.
- Who do I call for water under a pier and beam house?
- A drainage contractor for where the water comes from, and a foundation or crawlspace pro if wood or piers are damaged.
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Last reviewed November 8, 2026.