Soil conditions in New Providence vary by location. Here's what to order, how much to order, and how to time the delivery before you pour.
New Providence soil is mainly marl and limestone. Before you pour any concrete slab, you need a compacted base course to prevent cracking, settling, and water intrusion. The base course is not optional — it's what keeps your slab flat five years from now.
Standard spec is 4 inches (100mm) of compacted crushed limestone base course. For slabs under heavy traffic or equipment — warehouse floors, equipment pads, loading aprons — go 6 inches. For residential floors on stable ground, 4 inches is standard.
Calculating your yardage: measure the slab footprint in feet, multiply length × width × depth in feet, then divide by 27. Example — a 30ft × 40ft slab with a 4-inch (0.33ft) base equals 30 × 40 × 0.33 ÷ 27 = 14.7 yd³. Add 10–15% for compaction loss and site waste. Round up to the nearest 5 yd³ when you order.
One rule that saves re-orders: schedule the delivery for the same day you compact. Crushed limestone left on site overnight picks up moisture and compacts unevenly. Have your roller positioned before the truck arrives. If you're doing multiple lifts, lift-and-compact each layer before the next delivery rather than dumping everything at once.
TNB delivers base course by the cubic yard, minimum 10 yd³ for New Providence delivery. For larger orders, we can schedule multiple loads through the day to keep material fresh. Contact us with your slab dimensions and we'll confirm the yardage and delivery window.