How thick does a concrete driveway need to be in New Brunswick to handle a loaded pickup truck or delivery van without cracking?

For a residential driveway that needs to handle a loaded pickup truck or delivery van, you need a minimum of 6 inches of concrete — not the 4-inch standard you'll see quoted for light passenger vehicles.

Most concrete driveways in New Brunswick are poured at 4 inches, which is adequate for regular cars and light SUVs. But a half-ton pickup loaded with lumber, a three-quarter-ton truck, or a delivery van (which can gross 8,000–11,000 lbs fully loaded) puts concentrated point loads on the slab that 4-inch concrete simply wasn't designed to handle repeatedly. Over time, those loads combined with NB's freeze-thaw cycles will crack a thin, under-reinforced slab — often within the first five years.

Thickness Is Only Part of the Equation

The concrete itself is only as good as what's underneath it. A 6-inch slab sitting on soft, poorly drained, or organic soil will crack just as fast as a 4-inch slab. The base preparation matters enormously. You need a minimum of 6 inches of compacted granular gravel (crushed stone, not bank-run gravel) beneath the slab, and the subgrade below that needs to be stripped of any topsoil or organic material and compacted. In NB, spring thaw is particularly brutal — saturated subgrade loses its bearing capacity every March and April, and a slab without a proper granular base will flex, crack, and settle as the ground heaves and softens beneath it.

Reinforcement is non-negotiable at this thickness and load. Welded wire mesh alone is marginal for heavy-vehicle driveways. Specify #10M rebar on 16-inch centres (or at minimum 6x6 wire mesh supported on chairs at mid-slab height — never laid on the ground). The reinforcement doesn't prevent cracking, but it holds the slab together after cracking occurs, preventing slabs from separating and shifting into a trip hazard or a drainage problem.

The NB Climate Factor

New Brunswick's 150+ freeze-thaw cycles per year make mix specification as important as thickness. You must specify air-entrained concrete at 32 MPa (4,500 PSI) minimum for a heavy-use driveway — not standard 25 MPa mix. The air entrainment (4–7% air content) gives freezing water room to expand without fracturing the concrete matrix. The higher strength rating gives the slab more capacity to resist the flexural stress of heavy loads. Expect to pay $210–$250 per cubic yard for a quality air-entrained 32 MPa mix delivered in NB.

Control joints are critical. Space them no more than 10 feet apart in each direction on a heavy-use driveway. Without them, the slab will crack randomly — usually right where a truck tire sits. A saw-cut or tooled control joint at one-quarter the slab depth (1.5 inches deep on a 6-inch slab) creates a controlled crack line that stays tight and manageable.

Practical Cost Context

A 6-inch driveway uses 50% more concrete than a 4-inch pour. For a typical two-car driveway of 500 square feet, you're looking at roughly 9–10 cubic yards of concrete versus 6 cubic yards — a difference of $600–$900 in material alone. Fully installed, expect $12–$18 per square foot for a properly specified 6-inch heavy-use driveway in NB, compared to $8–$12 for a standard 4-inch residential driveway.

Don't skip the sealer. A penetrating silane/siloxane sealer applied 30 days after the pour and reapplied every 2–3 years is essential — it blocks the salt-laden slush that delivery trucks track in from NB roads all winter, which is one of the fastest ways to destroy a driveway surface.

If you're getting quotes, ask each contractor specifically what thickness, mix strength, air content, and reinforcement they're pricing. A contractor who quotes 4 inches of 25 MPa non-air-entrained concrete for a heavy-use driveway is setting you up for an expensive replacement in under a decade. New Brunswick Concrete can match you with local contractors who understand heavy-use driveway specs — get matched for a free estimate through the New Brunswick Construction Network.