Fontana Concrete Pro places interior floors screeded to a measured flatness, jointed around what rolls across them, and read for moisture first. Every estimate is measured and written on site.
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Interior floors in Fontana
An interior floor is judged on flatness and moisture rather than on strength. Whatever ends up on top of it, vinyl plank, tile, a rack leg or a polish, reads every dip in the surface and every ounce of water still moving up through the concrete, and neither of those is fixable once the covering is down.
Fontana Concrete Pro was founded in 2019 by Andre Whitfield after 18 years on Inland Empire crews, and he runs the straightedge behind the screed himself. Two kinds of interior floor come out of this city: a unit on the Slover Avenue corridor where a forklift and a pallet rack decide the layout, and a back room or a converted ADU where the question is what a floor covering will put up with.
Floors go in to the California Residential Code, built by a CSLB C-8 licensed crew with liability insurance on every job. A new floor inside an existing shell on the same footprint is minor work; a habitable floor in a conversion or a new unit belongs to that building permit, filed on the Build Fontana portal at the Building and Safety Division. Every floor carries a written workmanship guarantee against defects in how it was built.
Warning signs
Click-together flooring that ticks at a seam or lifts at one end is reading a dip, not a bad plank. Most of it wants the slab flat inside 3/16 of an inch over 10 feet, and a hand-floated floor rarely is. The void under it grows every time somebody walks that line.
Lay a straightedge across a saw cut and if it rocks, the slab has curled. The top dried faster than the bottom and pulled the edges up, and under a pallet jack or a hand truck those raised lips break away pass by pass until the damage runs back into the field.
Vinyl that discolours, bubbles or smells sharp along the seams is adhesive coming apart in moisture. A relative humidity probe set at 40 percent of the slab depth gives you the real figure, and a reading above what the flooring maker allows will do it again.
Base plates leaving shallow dishes in the floor mean the slab was never built for a point load. A leg carrying a couple of tons through a plate the size of a hand needs both thickness and compacted ground beneath it, and once one bay settles the run goes out of plumb.
What's included
Standard on every interior floor and itemized once rather than added later. Each line answers either the moisture coming up from below or the flatness that whatever you lay on top will show.
Old covering, adhesive and coatings are ground off, because a floor is measured and bonded to concrete rather than to what sat on it.
Relative humidity probes read the slab at 40 percent of its depth, so a covering is chosen against a figure instead of against a hope.
Base is graded and compacted in lifts and probed across the whole room, since a floor can only be as flat as the ground it was placed on.
A 10-mil sheet lapped and taped under any heated room, so ground moisture stops at the plastic rather than under your flooring.
Four inches through a room people live in, 6 inches with a rebar mat wherever a forklift runs or a rack leg lands.
The wet slab is straightedged in both directions and the finished floor checked against the tolerance your covering asks for.
Cuts are laid out on paper around doorways, columns and rack lines, then sawn within hours in squares no wider than 12 feet.
A semi-rigid filler carries the joint edges under wheels, and the room is vacuumed and the waste hauled before the crew leaves.
Your options
Set against what will stand or roll on the floor, because the traffic and the covering decide the flatness long before anybody decides the finish. The row is settled at the visit, in the room itself.
| Option | What it suits | Flatness | Upkeep | Days in the room |
|---|---|---|---|---|
| Troweled and sealed | Workshops, storage rooms, back rooms | Straightedged, no covering to satisfy | Reseal about every 3 years | 2 days, 7 before it is used |
| Ground and polished | Living space, offices and showrooms | The flattest of the four, ground true | Damp mop, reburnish every 5 years | 3 to 4 days once the slab is dry |
| Ready for a covering | Tile, vinyl plank or carpet over the slab | Inside 3/16 of an inch over 10 feet | Whatever the covering itself asks | 2 days, then the moisture test |
| Racking rated slab | Forklift aisles, pallet racks, machine bases | Measured along the aisle lines | Refill the joints as filler wears | 3 days, 28 before full loading |
A covering-ready slab is the least work in the room and a polish the most, though a polish asks least of you later. Every estimate is measured and written on site.
Local knowledge
This city asks two very different things of an interior floor, and the two sit about two miles apart on the map.
Along the Slover Avenue corridor the work is light industrial: units where a counterbalance forklift crosses the floor all day and pallet racking stands on plates the size of a hand. Flatness there is measured along the aisle a truck drives rather than across the room, and the joint grid is drawn around the rack lines before a saw is started, because a joint sitting under a wheel path is the first thing on that floor to break.
North of it, on the Kaiser-era streets south of Valley Boulevard, the houses are 1950s mill-worker stock and the interior floor is nearly always part of a conversion: a back room, a bay or a detached unit getting a floor somebody will live on. Those slabs went down on the fan with no sheeting, so the first number is a moisture reading rather than a finish, and where a whole new room is going up the floor arrives with its slab foundation rather than after it.
Our process
Five stages, and the two that decide the result both happen before concrete arrives: what the room is measured to, and what the slab reads for moisture. One crew, one written figure, and honest dates for the drying.
Andre Whitfield measures the room, works out how a pump or a buggy can reach it and takes a moisture reading off any existing slab.
You settle what goes on the floor, the tolerance that finish needs, and where the cuts fall around doorways, columns and racking.
The room is emptied, covering and adhesive are ground off, the base is compacted in lifts and the vapor retarder lapped and taped.
Concrete comes through the doorway by pump or buggy, is straightedged in both directions and power troweled to the finish you picked.
Joints are sawn within hours, the slab cures 7 days before the room is used, and you walk the floor with Andre Whitfield afterward.
What moves the estimate
Square footage is the starting point and access moves it most, because concrete has to get through a doorway into a room with a roof already on it. Both are settled on the floor itself before a figure is written. Every estimate is measured and written on site.
A room at a roll-up door takes a buggy. One 80 feet inside a building takes a pump line, and every length of hose adds crew and time.
A troweled shop floor and a slab ground true for vinyl plank are different amounts of work over the same square footage.
Furniture asks 4 inches. A rack leg or a forklift asks 6 inches and a rebar mat, over ground built to take a point load.
Tile, adhesive or an old coating has to be ground away with the dust contained, and that is a day before any concrete is ordered.
The measurement and the written figure cost nothing, and you hear back within 1 business day once the form reaches the yard on Sierra Avenue. (909) 555-0168 or send us a message.
Send the form or call the yard on Sierra Avenue. Andre Whitfield measures the room, reads the existing slab for moisture and writes the figure before he leaves, and nothing is owed for that visit either way.
Reviews
Left on Google and Facebook by people whose interior floors this crew placed, ground or polished. All three are floors inside a building rather than drives, patios or yard work.
“We took a unit off Slover with a floor that had never been jointed properly. They drew the cuts around where our racking was going before they sawed anything, and the forklift crosses the whole aisle now without a bump anywhere in it.”
“Our addition slab still read wet in December so they told us to hold off on the vinyl. They came back in January, probed it again, and it passed. I would rather wait six weeks than pull a floor up twice, and nobody tried to sell me a coating in the meantime.”
“The back of our 1954 house became a studio and the old slab was nearly two inches out across the room. Andre floated a new floor over it, ground it flat and polished it. The furniture sits level and the aggregate shows wherever the light comes in.”
FAQ
What people here settle before a floor is booked, answered with the tolerances, the drying times and the tests this crew actually works to.
Area first, then access, then the flatness the finish demands. A 300 square foot back room and a unit off Slover Avenue are different days, a pump line run through a building costs more than a buggy at a roll-up door, and a slab ground true for vinyl plank is more work than a troweled shop floor. Every estimate is measured and written on site.
It depends on the covering, and the covering says so in writing. Most click-together flooring asks for 3/16 of an inch over 10 feet, tile asks something similar over a shorter span, and a warehouse aisle is measured along the path a forklift drives instead of across the room. We straightedge the wet slab and check the finished floor against the number your material names.
It depends what the room is. Putting a new floor inside an existing shell on the same footprint is minor work. A habitable floor going into a conversion, an addition or an ADU belongs to that building permit, which is filed on the Build Fontana portal under our license, and we meet the inspector rather than sending you to a counter.
Walk on it after 24 to 48 hours, use the room at 7 days, and expect full strength at 28. A forklift or a loaded rack waits the whole 28. Flooring is a separate wait: the slab has to pass a moisture test first, and a fresh slab under a sealed covering usually needs a month or more of drying before a probe reads low enough to lay on.
Moisture from underneath, almost every time. Vapor rises out of the fan gravel, travels up through the concrete and gathers under anything that seals the top until the adhesive gives up. That is the ordinary outcome on the older streets here, where slabs went down with no sheeting under them. A humidity probe at 40 percent of the slab depth gives you the number before you buy the next floor.
Six inches with a rebar mat where a forklift runs or racking stands, and 4 inches where the load is people and furniture. Depth is only half of it, because a point load through a rack base plate is carried by the compacted ground as much as by the concrete, so the base goes in as tested lifts and is probed across the whole floor rather than where the machine happened to reach.
Often, yes. A slab that is sound but out of tolerance can be ground down at the high spots or brought up with a cementitious underlayment, and either is less work than breaking a floor out. What rules it out is concrete cracked through, curled at every joint or reading wet, since none of those is a surface problem. A test hole and a probe say which one you have.
On a grid no wider than 12 feet, sawn within hours of the finish and laid out on paper first. Cuts are pulled to line up with doorways, columns and inside corners, because a slab left to itself cracks from a re-entrant corner outward. In a unit with racking the grid is set so no joint lands in the aisle the forklift crosses, since that is the one that breaks.
Service area
Rooms, shops and units we floor past the city line, listed nearest first. Whatever the town, the slab is straightedged for flatness and read for moisture before a covering is ever chosen.
Four jobs that meet an interior floor at its edges, measured on the same visit and written onto one estimate rather than quoted by two trades on two different days.
The engineered pad a new room or ADU stands on, poured before its floor.
Sawing a joint grid, a doorway or a drain line into a slab already down.
The bay next door, poured thicker and sealed against dust and dropped oil.
Color, stain and a sealed finish worked into the same interior slab.
Call the yard on Sierra Avenue or send the form and you hear back within 1 business day. Tell us the size of the room and what will be laid on it or driven across it, and the measurement can be booked inside the week.