Jurupa Valley Concrete Pro builds driveways, patios and floors in San Dimas, the farthest town we reach. Some 14 inches down the soil turns to clay, and winter rain stops there rather than draining.
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Under the older parts of San Dimas the soil changes at about 14 inches down. Above that it drains. Below it the clay content more than doubles and water moves through at roughly a third the rate.
The USDA maps the central streets as a complex whose dominant soils carry an accumulated clay horizon at that depth. In practice winter rain does not keep going down. It reaches the layer, spreads along the top of it, and sits under your slab as a wet zone that dries at different rates, fast where sun reaches the edge, slowly where a wall shades it. Ground that dries unevenly moves unevenly, and a slab bridging it cracks at the point of least support.
So the base course here has a job it does not have on free-draining ground: it has to get water sideways to somewhere it can leave. We excavate past the topsoil, lay and compact base, fall the subgrade as well as the surface, and put drainage at the low edge where a slab meets a wall or a planter. Above that it is the standard we build to everywhere, 3,500 psi mix, steel through the slab, joints cut the same day and a full 7 day cure.
The city is foothill alluvium at the top, made ground in the graded tracts, and an older soil with a clay layer in it through the middle. Each of the three wants something different underneath a slab, and this is what that comes to.
Drives here are mostly original to the 1970s tracts and fail along the joints rather than in the middle. Under the older streets the reason is 14 inches down: rain reaches a clay layer, spreads sideways and softens the subgrade unevenly. We dig past the topsoil and compact base.
A patio slab in the downtown residential zone does not count toward your lot coverage, which surprises people who assume every square foot is spoken for. The city counts patio covers, trellises and carports against the 35 percent limit and excludes slabs, hardscape and drives.
Stamped patterns sit well against the early California styles the older streets are built in, Craftsman bungalow, Spanish Colonial Revival, Queen Anne. The pattern goes into a 4 inch pour and gets 2 coats of sealer. On a historically significant house the city reviews it first.
Walks off Bonita Avenue and San Dimas Avenue are old enough that the grade around them has changed since they were laid. We saw the failed panels out square, correct the fall underneath, and dowel new into old so the joint stays flush. That is a Public Works permit of its own.
Garage floors on the foothill streets sit on gravelly wash off San Dimas Canyon, which drains fast; floors on the graded tracts sit on made ground, which does not. The two need opposite things, so we test rather than assume. A 10 mil barrier goes under anything new.
Exposed aggregate reads as the right material here, because the town has kept a rustic character on purpose and a wide expanse of smooth gray concrete fights it. We wash the surface back to bring the stone up, or use a light integral color with a broom finish.
Read this one before you plan a wall. San Dimas does not use the state's 4 foot exemption. The city's own handout puts the line at 3 feet, footing to top of wall, and drops it altogether where a surcharge bears on the ground behind. Elsewhere that same wall needs no permit.
Interior slabs go in for garage conversions, casitas and rooms taken out of a hillside. On the graded lots the ground under the floor is fill placed by a machine 50 years ago, so we probe it, dig out anything soft, and pour over a 10 mil barrier onto compacted base.
This was Rancho San Jose, granted in 1837 to Ygnacio Palomares and Ricardo Vejar, and it was known as La Cienega Mud Springs for the marsh the springs made, which tells you where the water went long before anyone poured concrete on it. The railway arrived in 1887, the land boom laid out the streets, oranges paid for the town until the middle of the last century, and the city incorporated on 4 August 1960. It takes its name from the canyon in the San Gabriel Mountains above it.
The building record is the most concentrated on our list. Of about 12,370 homes, 32 percent went up in the 1970s and 53 percent between 1970 and 1989, so the original flatwork across most of the city is one generation of concrete reaching the end of its life at the same time. The soil survey also maps 45 percent of the surface here as urban land, already built on or paved, which is a useful reminder that almost nothing we do is a first pour.
Permits are issued by the Building and Safety Division at City Hall, 245 E. Bonita Avenue. Two local rules catch people out. The first is the 3 foot retaining wall threshold, a foot below the state's. The second is that work the city exempts from a building permit still needs Planning Department approval, and in the downtown residential zone additions are expected to reflect early California architecture. Right-of-way work is a separate Public Works file.
Four stages and one written figure, with the ground investigated before anything is priced. In a town where whole tracts stand on made ground, a quote written from the curb is a guess.
Daniel Reyes measures the area and opens the ground at one corner, so what the slab will sit on is known rather than assumed.
Topsoil and soft fill come out, base goes in and is compacted, and the subgrade is graded to move water to a low point.
We file with Building and Safety on Bonita Avenue, plus Planning and Public Works where the job needs them. You attend none of it.
Joints go in with the pour. Nobody walks on it for 24 hours and nothing drives on it for 7 days, and the forms leave with us.
Call or send the form and we will be in touch within 1 business day to book the visit. We measure, open the ground at one corner to see what is under it, and hand over a written figure before we leave.
Reviews
Written by the people who paid the invoice, across every town this yard covers and San Dimas with them. Each one follows a visit, a written figure agreed before work started, and a bill that matched it.
“They measured our driveway on a Tuesday and handed me the written estimate before they left. The crew was on site four days, poured 540 square feet at 5 inches in one morning, cut the joints that afternoon, and after its first summer over 100 degrees there is not a crack in it.”
“A tree root had lifted the same sidewalk slab three winters running. They cut the root back, set a root barrier, poured the new section 4 inches on compacted base and pulled the right-of-way permit themselves. Ten months on it is still flat.”
“Our patio was original to the house, 1980s and crumbling. Daniel walked the base prep with me before they started: they dug out the clay, packed gravel in layers, poured 300 square feet in ashlar slate and sealed it at 28 days. It looks like cut stone.”
Six things people here ask first: what the city's own permit rules are, why the ground behaves as it does, what a wall costs you in paperwork, and how far out we come.
Because what is under the existing surface decides most of the figure. A lot on foothill wash needs little more than base and compaction. A lot on made ground, or one where the clay layer is holding water beneath the old slab, needs excavation, drainage and material carted away. The rest is area, thickness, steel and finish. Every estimate is measured and written on site, in this case off a tape and a test hole.
Only under 3 feet, which is a foot lower than the line most cities work to. San Dimas exempts a retaining wall up to 3 feet where the state code allows 4, and the exemption falls away entirely where the wall carries a surcharge such as a drive sitting above it. Flatwork is judged separately: a walkway or driveway needs no permit while it stays no more than 30 inches above adjacent grade.
No. In the single-family downtown residential zone the city counts structures against the coverage limit and lists patio covers, trellises and carports as structures, while patio slabs, hardscape, driveways, swimming pools and spas are specifically excluded. So the slab itself is not the constraint, a solid roof over it is. We will tell you which side of that line your plan falls before it is drawn.
Because it reaches a clay horizon about 14 inches down and stops. Above it the soil drains normally; at that depth the clay content more than doubles and water moves through at roughly a third of the rate. Rain arriving faster than the layer can take it spreads sideways instead. You can look your own parcel up on the USDA Web Soil Survey and see the horizon listed.
Probably, and you are not alone on your street. A third of the housing in San Dimas went up in the 1970s and just over half between 1970 and 1989, so the drives and walks across most of the city were poured within one 20 year window and are reaching the 30 to 40 years the material is good for together. Map cracking and joints that have stepped rather than opened are the signs worth acting on.
Yes. San Dimas is the farthest town on our coverage list and still inside the 25 mile radius we work to, and we would not list a town we could not service properly. In practice that means we schedule work here in blocks rather than a day at a time, so the crew is on your street for consecutive days. We will confirm within 1 business day which dates we can hold.
You are at the outer edge of what one yard covers well, and La Verne, Claremont and Diamond Bar are the towns on our list closest to you. The full list is below, nearest first. Pick the town your address sits in, because the rules change at the line.
Open the Jurupa Valley Office in Google Maps Say what you want built and whereabouts on the plot it goes. You will hear back within 1 business day, we measure and open the ground at your address, and the job is signed off against a written workmanship guarantee against defects in how it was built.