Ontario Concrete Pro replaces driveways, pours patios and builds retaining walls in Diamond Bar, 15 miles west of our Ontario yard on the 60. Every estimate is measured and written on site.
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Diamond Bar is a hillside city, and most of its lots are half cut and half fill. A slab that crosses the line between the two sits on ground that moves at two different rates.
The cut side is native clay off the Puente Hills, which swells when the winter rain reaches it and shrinks back through the dry summer. The fill side is that same clay pushed over the edge of the pad and compacted when the tract was graded, and it settles a little more every wet year. A driveway poured straight across both, as the 1970s builders did, cracks along the line within a decade, and the crack steps because the two halves no longer sit at one level.
So on a Diamond Bar lot we find that line before we pour. The old slab comes out, the subgrade is probed with a bar, and where cut meets fill the soft side is dug to firm material and brought back in compacted lifts. Four inches of Class 2 base goes over the whole area, number 3 steel runs on an 18-inch grid, and a control joint is cut on the line itself, so whatever movement is left shows as a straight joint rather than a crack.
Diamond Bar was laid out in the 1960s and built through the 1980s, so concrete here is at the age where it is replaced rather than added. Most of what we take out was poured across a cut pad and a fill slope in the Puente Hills.
A Diamond Bar driveway usually pitches down to the street off a pad cut into the hill, and the 1970s originals were poured thin and without steel. We replace them at 4 inches on compacted base with steel on an 18-inch grid, broomed across the fall so a tire holds.
Patios in Diamond Bar sit on the flat strip between the house and the slope, so the first question is where the runoff goes. We pour 4 inches on base, grade the slab away from the house, and drain the toe of the slope, because a patio that dams the hill lifts at its back edge.
Stamped concrete is asked for on Diamond Bar entries and courtyards, where the houses off Grand Avenue were finished in tile and brick and a plain broom looks unfinished beside them. We stamp a 4 inch slab in slate or ashlar, color it through the mix, and seal it in 2 coats.
Diamond Bar sidewalks on the older streets were poured with the tract, and the parkway trees have grown into them and lifted the panels. We cut back to the nearest sound joint, check with the city where the tree is theirs, and dowel the new panel into the old so it cannot step.
Garage floors in Diamond Bar are the slabs poured with the house in the 1970s, and they rarely sink. What they do is dust, pit and crack at the door. We grind the surface, patch the pits and pour a bonded overlay, or replace the slab where cracks have opened past a quarter inch.
Decorative concrete in Diamond Bar is a color or an exposed aggregate finish on a front walk or a pool surround, because the streets in The Country Estates ask for a finish that suits the house. We pour integral color, wash the aggregate out at 4 hours, and seal it once cured.
Retaining walls are the job Diamond Bar asks for most after driveways, because nearly every lot ends in a slope. A wall over 4 feet is engineered and permitted, footed into the native clay rather than the fill, and drained with gravel and a perforated pipe behind the stem.
Interior floors in Diamond Bar are mostly room additions and converted garages on a house from the 1970s. We pour the new slab over a vapor barrier on compacted base, dowel it into the existing foundation so the two move as one, and trowel it flat enough to take tile.
Our yard is on Holt Boulevard in Ontario, and Diamond Bar is 15 miles west on the 60, off the Diamond Bar Boulevard and Grand Avenue exits. Permits go to the City of Diamond Bar Building and Safety Division. The city was incorporated in 1989, so the record for a slab poured before then sits with Los Angeles County, and we pull it when a job means touching a footing. Inside The Country Estates the association reviews the drawing as well, and we file with both before a date is set.
The ranch was graded in one program from the 1960s and the pads follow the contours, so a lot off Diamond Bar Boulevard or Golden Springs Drive is usually a flat house pad with a slope at the back and a driveway pitched down to the street. Those driveways are the job we see most. In the newer tracts off Grand Avenue the drives run longer and steeper, and a steep drive is broomed across the fall rather than along it, so a tire holds on a wet morning instead of sliding to the curb.
Water leaves Diamond Bar slowly. Clay drains poorly, and the slopes send roof and lawn runoff onto the flat pads, so every slab we pour here falls away from the house at a quarter inch per foot and a drain goes in wherever a slope meets a pad. The calendar runs later than in the flatland towns. The hills hold the winter wet into April, and from June to September we pour at first light, because a slab finished in the afternoon heat sets before it can be floated.
Four stages, from the first look at the slope to the last sweep of the drive. The measure comes before any figure, because a Diamond Bar lot hides its fill line under a lawn, and the figure is written once, on site.
Victor Salgado measures the slab, probes the pad for the line between cut and fill, and checks how the driveway falls to the street.
The old slab is broken out and hauled, soft fill is replaced in compacted lifts, and 4 inches of Class 2 base is plate-compacted.
We file with the City of Diamond Bar Building and Safety Division, and with your association where one covers the lot. No counter for you.
The pour takes a day, the joints are cut within 12 hours, and you walk on the slab after 24 hours and park on it after 7 days.
Call or send the form and we call back within 1 business day to set a time. Victor Salgado walks the slope, checks the fall of the drive, and writes the figure before he leaves, so the number you are given is the number the job is built to.
Reviews
Reviews left on Google and Facebook by homeowners in the towns we cover from Ontario, Diamond Bar among them. Read them for the slope work, since that is what most Diamond Bar jobs are.
“Our place off Euclid is from the 1920s and the drive still ran back to the alley. They replaced 400 square feet at 5 inches, matched the fall to the alley apron and cut the joints the same day. Victor was there from start to finish.”
“We built an ADU in the back garden and needed the slab done properly. They over-excavated the old dairy ground, brought in engineered fill and poured to the soil report. It passed inspection first time, which is not what I expected.”
“The warehouse yard on Jurupa Street was breaking up under the forklifts and we could not shut down to fix it. Ontario Concrete Pro poured 2,800 square feet at 6 inches over two weekends so we never stopped shipping. A year on the joints are still tight.”
Six questions from Diamond Bar callers, on what moves the estimate on a slope, who signs the permit, how the clay behaves through a year, and how long a driveway on a hill is out of use.
The slope, then the tear-out. A driveway in Diamond Bar usually falls to the street, so the forms are stepped and the pour is worked uphill, and the old slab has to be broken out and hauled before anything else. Thickness, steel and finish move the figure after that. Every estimate is measured and written on site, so nothing is guessed from the street.
The City of Diamond Bar Building and Safety Division. Flatwork at grade in your own yard needs no permit, but a retaining wall over 4 feet and a footing under a patio cover do, and grading on a slope often does, so we ask the counter before we cut. Work in the public right-of-way goes through the city as well. We file, meet the inspector, and hand you the closed permit.
About 15 miles, west on the 60. Our yard is on Holt Boulevard in Ontario, the drive is under half an hour outside the commute, and a crew due on site at 6 leaves at half past 5. We call back within 1 business day, and a measure in Diamond Bar is usually booked within the same week.
Because the ground under it is two kinds. A graded pad is native clay on the cut side and placed fill on the other, and the clay swells in winter while the fill settles. A slab poured across both with no joint on the line cracks there. We dig out the soft fill, compact base over the whole area, and cut the joint where the ground changes.
About 10 days from tear-out to parking. Breaking out and hauling the old slab takes a day, base and forms a second, the pour a third. Then the concrete needs 24 hours before foot traffic and 7 days before a vehicle, and on a steep drive we hold the full 7, because a tire turning on green concrete scuffs the broom finish.
Yes. Walnut, Chino Hills and Brea share a boundary with Diamond Bar and sit on the same run from Ontario, and each has its own page here. The crew and the specification are the same. What changes is the ground, since Walnut sits on the same hills and the older streets of Brea sit on the flat below them.
Diamond Bar shares a boundary with Walnut, Chino Hills and Brea, and all three are covered from the same yard in Ontario. If your street runs along one of those lines, the town page next door describes the same crew on slightly different ground.
Open the Ontario Office in Google Maps Send the form and we call back within 1 business day. The measure and the figure cost nothing, and the work carries a written workmanship guarantee against defects in how it was built.