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Commercial Slabs & Parking Lots · Joliet & Chicagoland
Parking lots and slabs, built for traffic.
Concrete parking lots and commercial slabs for property managers, developers, and general contractors across Joliet and Chicagoland. One crew, working 7 days a week to keep your project moving.
- Covers
- Parking lots · Commercial slabs
- Typical thickness
- About 5 in. for car lots and 6.5 in. for truck areas, per ACI 330 guidance.
- Schedule
- 7 days a week, so pours can land when your lot is quietest.
Source: PACA
What's included
Where the traffic is.
Concrete for the places customers park and trucks roll.
Parking lots
Parking areas sized for the traffic they carry, jointed into short panels and pitched to drain.
Source: NRMCA (ACI 330)
Commercial slabs
Building and site slabs poured level, with joints planned to control cracking.
Source: NRMCA
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Sized for what drives on it.
Parking-lot concrete follows the traffic. Here's how industry guidance (ACI 330) sizes it.
| Car parking | Truck traffic | |
|---|---|---|
| Built for | Cars and light trucks in customer and employee parking. | Delivery trucks, service vehicles, and heavier loads. |
| Typical thickness | About 5 in. | About 6.5 in. |
| Joint spacing | About 10–12 ft on a 5 in. slab. | No more than 15 ft. |
Car parking
- Built for
- Cars and light trucks in customer and employee parking.
- Typical thickness
- About 5 in.
- Joint spacing
- About 10–12 ft on a 5 in. slab.
Truck traffic
- Built for
- Delivery trucks, service vehicles, and heavier loads.
- Typical thickness
- About 6.5 in.
- Joint spacing
- No more than 15 ft.
Not sure which applies? We'll look at the traffic your lot carries at your free quote visit.
How we build it
Planned, poured, reopened.
A lot is only as good as its base, its joints, and its drainage. Here's the order.
- 01
Walk the site
Traffic, drainage, and where the accessible spaces and their route need to go.
Source: Illinois Attorney General
- 02
Prep the subgrade
Compacted and graded to drain. ACI 330 guidance lets standard car lots go directly on compacted subgrade.
Source: PACA
- 03
Forms & grades
Forms set the edges and grades. Accessible spaces and aisles can't slope more than 1:48.
Source: U.S. Access Board
- 04
Pour & finish
Poured and finished by the same crew that prepped it, on a schedule that works around your business.
- 05
Cut the joints
Control joints follow the guidance: no more than 15 ft apart, closer on thinner slabs.
Source: NRMCA (ACI 330)
- 06
Cure & reopen
Cured before traffic returns. In Joliet's cold weather, flatwork is kept at 55°F for at least 5 days.
Source: City of Joliet
One crew from the subgrade to the last joint.
The standard
The numbers a lot gets held to.
From ACI 330 guidance, the Illinois Attorney General, and federal ADA standards. Ask any contractor for theirs.
5 in.
Car lots
ACI 330 guidance puts standard car parking at about 5 in., directly on compacted subgrade.
Source: PACA
16 ft
Accessible space
In Illinois, each off-street accessible space is 16 ft wide, including its striped aisle.
Source: Illinois Attorney General
1:48
Accessible slope
Accessible spaces and aisles slope no more than 1:48 in any direction under federal ADA standards.
Source: U.S. Access Board
Plan ahead
Get it right on paper first.
Count the accessible spaces
Illinois sets the number by lot size, starting at 1 for up to 25 spaces. The full table is in the FAQ below.
Source: Illinois Attorney General
Keep the route short
Accessible spaces belong on level pavement, on the shortest accessible route to an accessible entrance.
Source: Illinois Attorney General
Plan drainage early
Joliet's adopted codes include a Storm Detention Ordinance, so drainage belongs in the plan from day one.
Source: City of Joliet
Plan for salt
Where deicers reach the slab, NRMCA calls for at least 4,000 psi and 6–7% air for severe exposure.
Source: NRMCA
ACI 330 guidance puts standard car lots at about 5 in. and truck areas at about 6.5 in.
Source: PACA
When the lot is jointed into short panels, ACI 330 says distributed steel isn't necessary, and dowels aren't needed for most parking lots.
Source: NRMCA (ACI 330)
About 10–12 ft on a 5 in. slab, and about 15 ft on an 8 in. slab.
Source: PACA
Illinois sets it by the total number of off-street spaces:
- 1 to 25: 1
- 26 to 50: 2
- 51 to 75: 3
- 76 to 100: 4
- 101 to 150: 5
- 151 to 200: 6
- 201 to 300: 7
- 301 to 400: 8
- 401 to 500: 9
- 501 to 1,000: 2% of total
- Over 1,000: 20, plus 1 for each 100 over 1,000
- Hospital outpatient facilities: 10% of total
- Rehabilitation and physical therapy: 20% of total
Source: Illinois Attorney General
16 ft wide for off-street spaces, including a diagonally striped access aisle 8 ft or 5 ft wide.
Source: Illinois Attorney General
Federal ADA standards allow no more than 1:48 in any direction for spaces and their aisles, and Illinois' accessibility code applies as well.
Source: U.S. Access Board
We work 7 days a week, so the pour can be scheduled when your lot is quietest.
Get started
Let's plan your lot.
Request a free quote and we'll walk the site, look at traffic and drainage, and work out a schedule around your business. Prefer to talk? Call 815-836-1828, 7 days a week.
Free quotes, 7 days a week.