Fontana Concrete Pro pours garage slabs 5 to 6 inches over a 10-mil vapor barrier, saws the joints that day and hands the bay over sealed against dust. Every estimate is measured and written on site.
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Why Fontana garages come to us
A garage floor here has two jobs and most of them were built for one. It has to carry a point load, because this is a city where a floor jack, a pair of jack stands and a loaded trailer tongue all end up standing on it, and it has to keep the ground below from coming up through it. A 4-inch slab on bladed fan gravel does neither for long.
Fontana Concrete Pro was founded in 2019 by Andre Whitfield, who spent 18 years on Inland Empire flatwork crews first, and he trowels the door line on every bay himself. A Fontana garage is one of two things: a single bay off a Kaiser-era mill house south of Valley Boulevard, or a three-car bay on a tract poured since 1995. Neither fails the way the other does.
Floors go in under a CSLB C-8 concrete license with liability insurance on every job, to the California Residential Code. Replacing the slab inside your own garage usually needs nothing filed, and we confirm that at the counter rather than assume it. Turning that bay into a room or an ADU is a different job, and it goes to the Building and Safety Division through the Build Fontana portal. The floor carries a written workmanship guarantee against defects in how it was built.
Warning signs
Sweep the bay, and a week later everything on the shelves is gray again. That is the top eighth of an inch of the slab giving itself up, a surface closed over its own bleed water and never sealed. Sweeping compound moves it around; nothing put on top of it holds.
A three-car bay is around 24 feet across and shrinks as it cures. Where nobody sawed a joint into it, the slab makes its own, and the shortest line it can take is the diagonal. The crack widens a hair a year and every attempt to fill it opens again beside the old filler.
A jack stand puts a truck's corner through four square inches of concrete. On a thin slab over loose fan gravel that punches a shallow dish, and the ring of hairlines around it is the slab bending. Once a floor dimples in one spot it will do it in the next one you use.
Epoxy peeling off in palm-sized flakes is almost never bad epoxy. Water vapor moving up out of the ground pushes at the underside of the paint until the bond lets go, and on a slab poured with no sheeting under it that pressure never stops. The second coat fails faster.
What's included
Standard on every bay, with no line added to the estimate for any of it. Each one answers something a garage in this city does to concrete that a spare bedroom never would.
The existing slab is broken out to soil and hauled the same day, because a new floor bonded onto a cracked one inherits the crack.
The bay is cut to depth and graded base compacted in two lifts, probed across the whole floor rather than only where the machine reaches.
Sheeting laid over the base, laps taped and the edge turned up the stem wall, so ground moisture stops at the plastic and not at your coating.
A 5-inch slab in a 4,000 psi mix with a rebar mat on chairs, taken to 6 inches under anything you park a loaded trailer or a lift on.
Control joints cut within hours of the finish, on a grid no wider than 12 feet, so the shrinkage line lands where somebody chose to put it.
If the water heater lives in the bay, its 18-inch platform is formed and cast with the floor instead of being stacked on it afterward.
The slab is power troweled, then a densifier and a sealer go on, which is what stops the dusting and keeps dropped oil sitting on the surface.
The floor is kept damp through the cure, the bay is swept out, and you walk it with the owner when the guarantee is handed over.
Your options
Judged first on what stands on the floor, because that is the question that decides the rest of the row. Fontana bays hold work trucks, trailers and home workshops far more often than they hold a second sedan.
| Option | What it carries | Oil and dust | Lifespan | Days off the bay |
|---|---|---|---|---|
| Sealed 5-inch slab | Daily drivers, a workbench, seasonal storage | Sealer sheds both, resealed every 3 years | 40 years or more | 7 days before a car |
| 6-inch slab and steel | Work trucks, trailer jacks, a two-post lift | Same sealer, and thick enough to grind later | 40 years or more | 7 days, 28 before a lift |
| Epoxy over new | Anything the slab beneath it carries | Wipes clean, but chips where steel is dropped | Coat lasts 8 to 12 years | 11 days, coating included |
| Grind and densify | Only a slab already flat and uncracked | Ends the dust, does little for old stains | Buys 8 to 10 years | 2 days, no pour to cure |
A grind and densify is the least work and only suits a sound slab. The 6-inch build is the most, and it is the only row that takes a two-post lift.
Local knowledge
In this city the garage is a workshop, a trailer bay and a store for the tools of a trade. It is asked to take weight standing still, in small spots, for weeks at a time.
The older half of the answer is under the concrete. Garages behind the Kaiser-era streets south of Valley Boulevard went down on the raw fan in the 1950s with no sheeting between the ground and the slab, because nobody sheeted a garage then. Fan sand drains beautifully and still wicks, so moisture rises through those floors year round. It is invisible until somebody paints the bay, and then it is the only thing you can see.
The newer half is the joints. Three-car bays across the north tracts were poured in one 24-foot piece and often never sawn at all, so the slab relieved itself on the diagonal within its first two summers. We cut a grid no wider than 12 feet within hours of finishing, and where an existing floor is sound enough to keep, saw cutting a proper joint pattern into it is the cheaper way out.
Our process
From the first look at what is under your bay to the day the door closes on a floor you can put a jack on. One crew, one written figure, and the slab opened before anything is priced.
Andre Whitfield measures the bay, reads the fall toward the door and breaks a small test hole to see the base and whether any sheeting was laid.
You settle 5 or 6 inches, where the thickened areas go, and whether the floor is sealed or built to take a coating later on.
You empty the bay, we disconnect nothing electrical without an electrician, and the old slab comes out and goes for crushing that day.
Base compacted in two lifts, the vapor barrier laid and taped, the rebar mat set on chairs, then the pour and the power trowel.
Joints sawn the same day, the slab cured damp, then the densifier and sealer go down and you walk the floor with the owner.
What moves the estimate
The number of bays sets the floor and the load sets the depth, and between them sits whatever has to come out of the garage first. A one-bay mill house floor and a three-car tract bay are different days. Every estimate is measured and written on site.
A single bay off an older street is roughly 240 square feet. A three-car tract garage is closer to 700, and the joint layout changes with it.
A slab to break out and haul is a morning on its own, and what the test hole shows below decides how much base has to be brought in.
Five inches suits a car and a bench. A work truck, a trailer standing on its jack or a lift bolted down takes 6 inches and heavier steel.
Cabinets, a laundry pair or a water heater sitting on the slab have to be moved and reset, and that is trade time rather than concrete time.
The figure is written in your garage before we leave, it costs nothing, and someone rings you back within 1 business day to book the visit. (909) 697-3243 or send us a message.
Send the form or call, and someone rings you back within 1 business day to fix a time. Andre Whitfield opens a test hole in your bay and writes the figure there, and you keep it whether or not you go ahead.
Reviews
Left on Google and Facebook by people whose garages this crew poured. All three are garage slabs rather than drives, patios or walls.
“We had painted the garage twice and it flaked both times. They broke a hole in the corner and there was nothing under the slab at all, just sand. New floor with the plastic sheeting under it, coated three weeks later, and it has stayed put through a whole year.”
“I do my own engine work and the jack stands had left four dents in the old bay. Andre poured mine at 6 inches with a mat in it and thickened the strip where the lift posts bolt down. Been standing a one-ton on it since spring with nothing to see.”
“Three-car garage with a split running corner to corner and gray dust over every box we stored out there. They took the lot out, sawed the new floor into squares the same afternoon and sealed it. I hose it now and it dries clean.”
FAQ
The things people here settle before booking a bay, answered with the depths and the waiting times we actually work to.
Bay count first, then depth, then what has to be cleared out of the way. A single bay off an older street and a three-car tract garage are roughly 240 and 700 square feet, 6 inches with a rebar mat costs more than 5, and a water heater or a laundry pair on the slab adds trade time either side of the pour. Every estimate is measured and written on site.
Six inches with a rebar mat on chairs, not the 4 inches a tract builder laid. The load that breaks a garage floor is a standing one, a jack stand or a trailer tongue putting a corner of the vehicle through a few square inches, and depth is what spreads that into the base. Tell us at the visit where the heavy things stand and that part is built for it.
Usually nothing for a like-for-like slab inside your own walls and inside the lot line, though we ask the counter before the estimate rather than assume it. Converting the bay into a room, an office or an ADU does need a permit, which goes to Building and Safety through the Build Fontana portal. We say which of the two you have at the visit.
Moisture from below, in nine cases out of ten. Slabs poured around here before the 1960s went straight onto the fan with no sheeting, so vapor rises through the concrete constantly and collects under any coating that seals the top. The paint does not fail, the bond does. A calcium chloride test tells you before you spend anything on a second coat.
The top skin is weak, which happens when a slab is troweled while bleed water is still coming up or is left bare for 30 years. Tires and boots abrade that skin off as fine powder and it lands on everything stored out there. On a sound floor a grind and a densifier stop it; on a cracked or dimpled one it is not worth doing on its own.
Not through a new slab, because the old contaminated concrete leaves the site. Oil only soaks into concrete that is bare, so the sealer that goes down at the end is the part that matters afterward: dropped oil sits on top of it long enough to wipe. Reseal about every 3 years, sooner in a bay where you work on vehicles.
Walk on it after 24 to 48 hours, park a car at 7 days, and wait 28 days before a loaded trailer, a lift or anything you jack up. The concrete is still gaining strength through the whole month, and weight put on early does not crack it that day, it presses the slab into a base still taking up load. Sealing also waits for 28 days.
Yes, about an eighth of an inch per foot toward the opening, so a hosed floor and anything a car brings home in a February storm runs out rather than pooling at the back wall. Older bays here often fall the wrong way after decades of settlement. We shoot the levels at the visit and set the new floor to drain out through the door.
Service area
The towns this crew pours garage slabs in, nearest first and inside a 25 mile radius across 4 counties. Each name below opens that town's own page.
Four jobs measured on the same visit as a garage floor, and two of them are poured by the same crew on the same morning where they meet the bay.
Interior slabs for a shop, a workshop or a bay being turned into a room.
Sawing joints or a new opening into a slab that is otherwise sound.
The drive and apron outside the door, poured to meet the new floor level.
A slab from scratch for a detached garage, a shop or a new bay.
A free estimate, measured in the bay with a test hole open, and a call back within 1 business day. Tell us what parks in there and how old the house is, and the visit can be booked inside the week.