Thickness, Mix Design and Reinforcement
A standard residential driveway is poured at four inches over a compacted base. Where an RV, boat trailer, dump trailer or box truck will park, we step the pour up to five or six inches and tighten the reinforcement spacing. We specify a 4,000 PSI air-entrained mix for exterior flatwork in the Upstate because air entrainment gives the concrete microscopic voids that absorb the pressure of freeze-thaw cycling — the single most common cause of surface scaling on cheaply poured driveways.
Reinforcement is rebar tied in a grid and chaired to sit at the correct depth, or heavy welded wire mesh for smaller pours, usually combined with fiber in the mix. Steel does not stop concrete from cracking; it holds the slab together and keeps any shrinkage crack tight and level instead of allowing one side to drop.
