Below are some of the emails that arrived in our office after Hurricane Harvey. They illustrate many of the homeowner flooding problems. One of the key points we wish to communicate to homeowners is that concrete slab foundations were/are at risk DURING/AFTER Hurricane Harvey. When a house floods and the concrete foundation is submerged for some days, then the supporting clay soils underneath the foundation become saturated and expand in volume. Unfortunately, this expansion in volume is often NOT uniform and creates greater uplift in some areas of the foundation, which can produce cracks in the foundation. This dramatic expansion can also break under slab plumbing pipes.
The next problem for the homeowner is the gradual loss of moisture in the clay soils under the home’s foundation. The volume of the clay soils will gradually shrink in volume and this shrinkage is NOT uniform. As some of the clay soils shrink and pull away from the bottom of the slab foundation, the slab itself will have less and less support over time. The contraction in soil volume is magnified during a hot, dry summer and this is the time period where the slab foundation is at greatest risk of settlement – parts of the slab will crack and fall down until they reach the support of the shrunken soil.
Related Topics to House Raising / Lifting
Raising A House Above The Floodplain
Cost of Elevating A House Above The Floodplain
Slab Separation For House Elevation
Underground Support For House Elevation
FAQ and Terms
Resources For Flood Victims