Concrete Driveways

The difference is in the details most homeowners never see: the depth of the granular base, the position of the rebar, the specification of the concrete mix, and the placement of control joints. We don't rush any of those steps. A driveway that fails after seven years isn't a weather problem or a road-salt problem — it's a workmanship problem, and it's one we've never had to own.

We excavate to a depth that gives us room for the granular base plus the full slab thickness — typically 10 to 12 inches below finished grade. The sub-base is compacted in lifts with a plate compactor or jumping-jack until it doesn't yield underfoot. Forms are set to the driveway's design dimensions, pitched toward the street or a drainage swale, and staked so they won't shift under the weight of the concrete truck's discharge.

Before the pour we install a rebar grid — typically No. 10M bars on 12-inch centres — suspended on plastic chairs or rebar bolsters so the steel sits in the middle third of the slab. A rebar grid that's resting on the base adds almost no tensile strength because concrete cracks from the top down under load; the steel needs to be where the tension actually develops.

We pour driveways 4.5 to 5.5 inches thick depending on the vehicle loads expected. A standard two-car residential driveway gets 4.5 inches; if the homeowner parks a pickup truck, RV, or delivery van regularly, we go to 5.5 inches. The mix is 32 MPa air-entrained concrete ordered from a local ready-mix supplier with a target air content of 5 to 7 percent for Ontario's freeze-thaw environment.

Contractors who go thinner or skip air entrainment to shave cost are gambling with your driveway's surface. The first few winters it looks fine. Then the surface starts to scale — not from road salt alone but from the combination of salt, absorbed moisture, and the hydraulic pressure created when that water freezes inside the concrete's capillary pores. Air entrainment breaks that cycle.

Concrete doesn't dry — it cures through a chemical reaction called hydration, and that reaction needs moisture and time. After the final finish pass, we apply a curing compound or cover the slab with wet burlap and poly to slow evaporation, especially in the hot, windy conditions that are common in SW Ontario summers. Rushing the cure by letting the surface dry too fast shortens the driveway's service life by years.

Control joints are sawn or tooled at roughly 10-foot intervals and at any inside corner to give the slab predetermined places to relieve shrinkage stress. We recommend applying a penetrating silane-siloxane sealer within 28 days of the pour and resealing every two years. The sealer doesn't waterproof the surface — it reduces chloride penetration depth so road salt can't depassivate the rebar and trigger rust-induced cracking from the inside out.