Water under the home: what it is doing to the piers, the anchors, and the belly

Water under a manufactured home is the cause behind half the other problems on this site. It is what makes piers sink unevenly, straps slacken, bellies rot, and floors go soft. On the lower ground around Wildwood it is also common, because the soil survey puts the summer water table at two or three feet before a drop of rain falls. The piers and belly it damages are priced from the published table, pier rebuilds at $150 to $400 each and belly patches at $300 to $800, and the survey that finds the water and its source is free.

Check this first: where is it coming from?

Go and look after the next heavy rain, and again a week later.

Roof water. Is there a downspout, or no gutter at all, dumping onto the ground beside a pier? That is the most common source and the cheapest to fix. Water that lands next to the skirting goes under the skirting.

The lot. Does the ground slope toward the home on one side? Is the home in the low spot of the lot, or of the park? Does the water stand in one place under the home, or everywhere?

The ground itself. On the higher lots, in the Candler and Tavares sands, water drains away within hours. On the Sparr and Adamsville flats, and the Sumterville ground with clay in it, the survey maps a seasonal water table at 23 to 33 inches from June into the fall. Water under those homes in August is the water table, not a puddle, and it does not drain because there is nowhere for it to go.

Plumbing. A supply leak or a drain fitting weeping into the belly puts water under the home from above. It shows as a sagging belly in one spot and damp ground under it in dry weather.

The skirting. Sealed tight to keep animals out, with no vents, the space under the home never dries after the storm. Humid air does most of what standing water does, slower.

What the water does

To the piers. Saturated sand yields under a pad instead of compacting. A pier on wet ground drops faster and less evenly than one on dry sand, and the frame warps. After Milton dropped 5 to 10 inches on Sumter County in October 2024, with the Withlacoochee in flood for weeks and residents in the Oak Grove Village area of Wildwood trapped in their homes by flooding, homes on the low ground stood over saturated sand well into the winter, and the doors started sticking in spring. That is the sloping floor and soft floor call.

To the anchors. Anchor shafts corrode at the soil line, and wet ground holds an anchor differently from dry ground. Straps that were tight when the home was set slacken as the piers drop. See loose or rusted tie-downs.

To the belly. Saturated air under the home wicks into any tear in the bottomboard, soaks the insulation, and reaches the subfloor. A torn belly over dry ground is a slow problem; over wet ground it is a fast one.

To the skirting. Panels that stood in water have a bottom track full of silt and have lifted out of it. See skirting damaged or missing.

Cause, fix, and cost

Why it happens around Wildwood

Sumter County is a blanket of sand and clayey sand over the Ocala Limestone, and the ground around Wildwood and Oxford is split between high sand that drains in hours and low ground that does not drain at all in summer. The Lisbon climate station normals put 27.79 of the year’s 50.03 inches of rain into June through September, in afternoon storms. On the high sand that water moves through the ground and compacts it under the piers a little at a time. On the flats it fills the ground to within two or three feet of the surface and stays there until fall. Lake Okahumpka and Lake Deaton sit on either side of SR 44 east of town in what the water district describes as an erosional valley in a limestone terrain with thin surficial sands; the lots around them are the wet ones.

None of that is a defect in the home. It is the reason the crew looks at where the water goes before they look at the piers, and why a relevel on a wet lot without fixing the water is a relevel you buy again next year.

What the work involves

The free survey finds the water and its source while the crew is under the home for the pier readings: where it stands, whether the ground is saturated or just wet on top, whether the belly is holding water, whether the skirting is venting. The fix for the water is usually small and usually yours: gutters, extensions, grading. The fix for what the water did is pier and pad work on larger footings, a vapor barrier patch or replacement, and anchor work where the survey finds it, in that order, after the water is dealt with.

When to call

When water stands under the home a week after rain, when it comes back every storm, when the belly is sagging in one spot, or when the doors have started sticking after a wet summer. Tell us which side of the home is wet, where the downspouts go, whether the lot is low, and what the marble test showed. The level check is free and includes the drainage look.

We cover Wildwood, Oxford, Lady Lake, Bushnell, Coleman, Webster, and Leesburg.