Concrete Driveways in Delhi, Norfolk County

Sand seldom heaves. It washes out.

In clay country, water sits under a slab, freezes and lifts it. In Delhi, meltwater moves down through the sand instead, so driveways here rarely heave. The local failure is quieter. Where a downspout, a swale or a slab edge puts water in one place, the sand is carried off grain by grain, until one corner of the driveway has nothing under it and cracks under its own weight.

So we never pour straight on sand. We excavate, compact a granular base in lifts so it cannot migrate, and contain the edges so runoff cannot mine out the perimeter. Then we grade the driveway so water moves away from the house and off the slab, and we look at where the downspouts empty before we set a form.

Freeze-thaw and salt still count

Sand makes frost heave uncommon, but it does nothing for the surface. Lake Erie keeps midwinter flipping across zero, and Highway 3 carries road salt through town. We pour air-entrained 32 MPa concrete, the mix our spec calls for where freeze-thaw and de-icing salt are a fact of life, so the surface does not flake in its first winters.

Replacing an old driveway

When we replace a driveway, we break out the old slab, haul it away, find what cracked it (on sand, usually an undermined edge), fix that, and pour fresh. Where trucks or trailers park, we pour 125 mm instead of 100 mm.

Delhi books onto the same western Norfolk route as Courtland and Langton. A new driveway needs vehicles kept off for 48 hours at least, and heavy trucks off for a full week, so plan the pour around when you need the car.