Site Grading and Building Pads for Tilt Wall in Texas

Before a panel is cast, the ground has to be right, because a tilt wall building puts its whole weight on a few lines of footing and its crane on a pad of dirt. A pad that settles by an inch under a footing shows up as a cracked panel joint. A pad that holds water turns the casting bed into a pond. A crane that sinks into soft fill on lift day costs the owner a crew, a rental and a schedule slip.

We do the site grading and pad preparation for our own buildings, so the person who knows where the casting bed, the crane and the brace footings will be is the person grading the ground. The work covers clearing, cut and fill, moisture conditioning, compaction, testing, drainage grades and the final building pad to elevation, and it starts months before anyone sees a panel.

Sites around the state ask different things of a grading crew. Fort Worth sits over the Barnett Shale, with over 1,000 natural gas wells counted in December 2009, each well site occupying about 2 to 5 acres, so a site search there includes finding and avoiding old well pads and their setbacks. In the clay belts the grading plan is about moisture and swell. Along the coast it is about elevation and drainage.

Flooding adds another layer. The Texas Water Development Board reports that Senate Bill 8 directed the state's first-ever flood plan, built from 15 regional flood plans with more than 350 planning group members and over 550 public meetings, and the board approved the amended regional plans on March 5, 2024. For owners that means floodplain and drainage questions are getting more attention, and a pad that sits too low is a risk no one wants. Our work in Fort Worth includes that site-by-site review.

Some sites need approvals before a blade touches the ground. In the recharge, transition or contributing zones of the Edwards Aquifer, the Texas Commission on Environmental Quality requires that a plan be reviewed and approved under 30 TAC Chapter 213 before building, and states that technical review of an administratively complete application takes 90 days. That is a three-month item on the front of a schedule, and owners in the San Antonio area need to start it early.

Other items are common across the state: erosion and sediment control, a stormwater pollution prevention plan where required, floodplain development permits and city grading permits. Cities review grades against their drainage criteria, and many want detention in the site plan. We coordinate with the civil engineer and the plan reviewer so the grading plan we build matches the one approved, and our permitting and inspections work tracks each item.

Grading for a tilt wall building has special requirements. The building pad has to be uniform, compacted and tested to the geotechnical report. The area around the pad needs to carry a crane and heavy trucks without rutting. If panels will be cast outside the footprint, that bed area has to be flat and drained. Brace footings may sit outside the pad, and they need good soil too.

We strip topsoil, cut and fill to grade, process and compact in lifts, and test density and moisture. Where the soil report calls for lime treatment or select fill, we place and cure it to specification. We then set finish grades with GPS or laser, shape drainage swales and rough-in the utility corridors. The results feed the work in tilt wall floor slabs, which depends on a stable, level subgrade.

We test as we go. Density tests on every lift of fill, moisture checks on clay, and proof-rolling before slab prep are all routine, and we keep the results in a log for the engineer and the owner. A pad that passes is a pad we can stand on while panels are lifted.

Drainage is built in from day one. Temporary swales, sediment barriers and stable construction entrances keep rain from washing the site into the street, and they keep haul trucks out of the mud. On clay soils we schedule heavy grading for drier months when possible, and we stabilize the pad surface immediately after final grading so a storm does not undo the work. Where a site needs detention or a pond, we tie it into stormwater detention so the system works as one.

Grading is a weather-driven task. Dry weeks give production, wet weeks stop it, and clay soils recover slowly after rain. We add rain days into the schedule rather than promising a date that ignores the forecast, and we sequence work so that wet-sensitive tasks, like final subgrade and lime treatment, happen when the weather window is longest.

Utilities, footings and grade beams follow the pad, and the slab comes after that. A grading delay moves every task behind it, so we start early, mobilize quickly and keep a close eye on permit status. For owners with a fixed opening date, we lay out the critical path from grading to roof and show where the float is.

We prepare pads on prairie, coastal plain, hill country and desert sites. The tools are the same, the soils are not, and the plan changes with them. Owners in the industrial development world often have a standard pad specification, and we adapt it to each local geotechnical report.

A well-prepared pad does not guarantee a good building, but a poor one almost guarantees a bad one. That is why we start with the ground on every job and why we invite owners to review our grading plan before the first load of fill arrives.

Send us the survey and the geotechnical report. We will outline the grading scope, flag permit and drainage issues and give you a schedule that accounts for weather.

How long does it take to prepare a building pad?

It depends on the site, the soil and the weather. Clearing, grading and compaction for a large pad can take weeks, and clay or wet conditions extend it. We give a schedule once we have the geotechnical report and the grading plan.

What is the Edwards Aquifer review and does it affect my site?

If your site is in the recharge, transition or contributing zones of the Edwards Aquifer, TCEQ must approve a plan before construction, and its technical review of a complete application takes 90 days. Check early, since it can set your start date.

Do you need a geotechnical report before grading?

Yes. It tells us the soil type, bearing, swell potential and the treatment needed. We do not guess at the pad design.

Can you build on a site with old gas wells?

Sometimes, if the wells are properly plugged and setbacks are respected. Site research should find them early, and the pad plan has to work around them.

How do you keep the pad dry in rain?

By grading to drain, using temporary swales and sediment controls, and sealing the surface after final grading. We also avoid heavy work on saturated clay.