Low Ground and You Need a House Pad in Beaumont, TX

The clay under this city takes on water and swells, then gives it up and shrinks. On a low lot that cycle runs hard, because the ground stays saturated for weeks after a rain and then bakes in August. A long dry stretch after a wet year shows what that does: ground that has been wet for months dries out, shrinks and pulls away from the slab, and the slab moves with it. A pad on low ground has to break that cycle in two ways. It has to lift the slab out of the standing water, and it has to put a layer of material under the slab that moves less than the native clay. That second part is why select fill earns its haul cost under a house here even when local clay is fine under a barn. The pad is not just height. It is a different soil under the house than the soil around it.

Nobody can see six inches of fall by eye on this ground, and six inches is often the whole difference between a slab that stays dry and one that takes water in a hard storm. So the first thing we do on a low lot is shoot grades: the road crown, the flow line of the ditch the lot drains to, the neighbor's slab, and the lowest point of the footprint after a rain. Then the flood map. A great deal of low ground inside the city and along Pine Island Bayou, Taylor Bayou and the Neches is in a mapped zone, and Jefferson County floodplain administration sets a finished floor elevation above base flood for any house built there. That number often makes the pad taller than an owner planned for, and it is a far better surprise at the estimate than after the fill is placed. The finished pad elevation goes on the written quote so the slab contractor, the county and the owner are all working to the same figure.

Beaumont drainage is surface drainage. The clay does not absorb anything useful, so every drop that lands on the new pad has to run off it and then travel across the surface to a ditch. Inside the city that ditch usually belongs to the drainage district or the city storm system, and on the acreage at the edges it is a bar ditch on a county road or a channel the previous owner cut. Raising a pad on a low lot moves water that used to sit in the middle of the footprint out to the edges, and if the lot has no working outfall, it now sits against the house or on the neighbor. We shape the pad wider than the slab so it has shoulders, cut swales along the low side to the ditch, and reset the drive culvert at the right flow line. Where the lot needs a new connection to a district ditch, that is a permission question with Drainage District 6 that gets handled as part of the job, not something to find out about afterward. Interstate 10 and Highway 69 both cut across the city, and which side of them a lot sits on often decides where its water can go.

We come out and walk the lot, ideally after a rain, and shoot the grades before quoting. Once 811 has marked the utilities, the footprint gets stripped of topsoil, roots and whatever a previous owner left, wider than the slab. On the older infill lots in town that stripping turns up old fill, a filled ditch or the remains of a previous slab more often than people expect, and it all has to come out or be built around. Fill goes in shallow lifts and every lift is compacted with a padfoot roller before the next goes on, because a smooth drum seals the top of this clay and leaves the middle loose. If the stripped clay is too wet to take compaction we wait, and we say so, rather than build a pad on pumping ground. The pad is finished with sloped shoulders and the drainage cut the same week. Because the shop is in this city there is no travel in the quote, and the person who quoted the job is on the machine that builds it.