“Dirt” is not one product. The word covers a dozen materials that behave nothing alike, and buying the wrong one is the most common way a pad or a drive goes wrong before anyone has done a single thing incorrectly.
Select fill is the term to know, because it is what your slab contractor or engineer will write on a spec sheet. It is not fill dirt, and it is emphatically not sand.
We haul, place, spread and compact material across Montgomery County, plus the dozer and scraper work that shapes the ground once the material is on it.
What each material actually is
This is the glossary the rest of the job runs on. Ask for material by name.
| Material | What it actually is | What it is for | What it is wrong for |
|---|---|---|---|
| Fill dirt (unclassified) | Whatever came out of someone else’s excavation; quality varies load to load | Bulk volume — low spots, berms, raising ground | Anything structural, unless specified and accepted |
| Select fill | Blended sandy clay, plasticity index held in a specified range | Structural fill under slabs, pads and drives | Nothing, if it was specified |
| Bank sand | A fine, nearly non-plastic pit sand | Bedding, leveling, pipe backfill, arena base | A structural pad surrounded by clay |
| Topsoil | Screened surface soil with organic content | Lawns, beds, seeding, finish grade over a pad | Under a structure — organics rot into voids |
| Crushed concrete | Recycled concrete, crushed and graded | Driveway base and surface, laydown yards | Under a slab needing clean specified fill |
| Flex base / caliche | Graded crushed limestone, or caliche with fines | Base that locks up under a roller | Bulk fill — it is a base, not cheap volume |
| Native clay / gumbo | The ground you are standing on | Pond dams and cores, where tightness is the point | Under a slab, where shrink and swell is the problem |
Select fill, bank sand, and the bathtub under your slab
Select fill exists because both obvious choices are bad. Raw Montgomery County clay swells when it takes on water and shrinks when it dries, putting that movement straight under your foundation. Clean sand does not move, but it has no cohesion and here it creates a different failure. Select fill splits the difference: enough clay to compact tight, enough sand to keep plasticity low.
That is why a spec says select fill with a plasticity index range, not “good dirt.” Treat a PI band as a purchasing instruction — a pit can tell you what a material tests at. A load that showed up because it was available is not a load that meets the spec, and once a slab is on it nobody can tell which you got.
Now the bathtub. Clay is essentially impermeable. Drop a pad of clean sand into ground like that and you have built a porous middle inside a watertight bowl. Water finds the sand, runs through it, hits clay and stops. The sand stays saturated year round while the clay at the perimeter goes through its normal wet-dry cycle, and that differential is what moves a foundation. The same thing happens in a utility trench backfilled with sand through clay — a French drain nobody designed.
None of which makes sand bad material. It is a problem only as structural fill in ground that will not let it drain. For what happens to select fill once it is down, see site prep and grading.
Hauling in, hauling out, and what “balanced” means
The cheapest cubic yard on any job is the one that never gets on a truck. What separates a reasonable dirt number from an unreasonable one is freight, not machine time.
A balanced site is one where cut matches fill. High ground comes down, low ground comes up, the volumes cancel, and material moves across the property. Nothing enters or leaves.
Unbalanced goes one of two ways and both cost money. Short, and you buy material and pay to haul it, with pit distance often mattering more than the material itself. Long, and you pay to take dirt away. So ask any quote which of the three it assumes — a number built on balanced earthwork and one built on imported select fill are not comparable.
Find somewhere on the property for surplus to live — a berm, a low area, a future barn pad, base under a new drive. Material that stays is free material, which is why a pond and a pad get planned together. See ponds and excavation.
Truck access decides whether hauling is fast or slow, and on raw acreage the drive often has to exist before dirt can be delivered — see driveways and culverts.
How material is measured, and why “a load” is not a unit
The unit is the cubic yard. Anyone quoting “three loads” has told you nothing, because a tandem dump, a truck-and-pup and a belly dump haul materially different volumes. Ask for yards.
Then ask which kind of yard. The same dirt occupies three volumes. Undisturbed in the ground it is a bank yard. Loosened in a truck bed it has swelled, commonly twenty to thirty percent. Compacted into a pad in lifts it shrinks back, sometimes below where it started. Loose yards and compacted in-place yards are different numbers for identical work — so order more than the hole appears to need.
Some material sells by the ton. Base, crushed concrete and sand are commonly weighed, and converting tons to yards depends on density and moisture. A wet load weighs more and the extra weight is water: buying aggregate by weight after three days of rain is buying rain.
Moving it and placing it — dozers, scrapers and lifts
Machines differ because haul distance changes everything. A dozer pushes efficiently over short distances and shapes large areas. A scraper or pan carries over longer on-site hauls, which is how volume crosses acreage without trucks. An excavator loading trucks is how material arrives or leaves. A box blade or grader sets the final surface.
Dumping is not filling. A pile tipped out and pushed level is loose all the way through. Fill that will carry anything goes down in thin lifts, each compacted before the next, at a moisture content where the material knits. Which is also why “dumped in the driveway” and “placed where it goes” are different scopes.
Strip before you fill. Grass, topsoil and root mats under new fill decompose into voids. Organics come off, the subgrade gets proof-rolled for soft spots, then material goes down. Stumps and root balls come out rather than get buried — see stump removal.
Be careful with free fill dirt. Someone offering to dump spoil at no charge is solving their export problem with your land. Sometimes it is clean; sometimes it arrives with broken concrete, root wads or material that will not compact, and you own it permanently. Under anything you plan to build on, no.
Common questions
What is select fill, and do I actually need it? A sandy clay blend with a controlled plasticity index, used as structural fill under slabs, pads and drives. If your builder or engineer specified it, yes — the PI range is part of what you are buying.
Can I use regular fill dirt for my pad? Under a structure, not unless someone has specified and accepted it. Unclassified fill is useful for berms and low spots, wrong under concrete.
How much dirt do I need? We measure area and depth change and give you a yardage rather than a load count, and we say whether it is loose or compacted in place.
Do you haul dirt off, or only bring it in? Both, and they are scoped separately — so we can look for somewhere on the property to put surplus before quoting trucks.
Can you just dump it and I will spread it myself? Yes for landscape material. For structural fill, no — the value is in lifts, moisture and compaction.
Will topsoil fix a yard that holds water? Rarely — it just gives water a higher place to stand, and where you send it next is your responsibility, including onto a neighbor. See site prep and grading.
A dirt job is priced on movement, not area — how far material travels and whether any has to leave at all. That logic is explained here.
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