Driveway Thickness Guide for Cars, Trucks, and RVs
Proper thickness prevents cracking and premature failure. 4 in for cars, 6-8 in for RVs and heavy trucks.
Why Driveway Thickness Matters
While homeowners often focus on the visible surface of their driveway, the hidden layers beneath—the subgrade and base—are actually more critical to long-term performance. A driveway is only as good as what lies beneath it.
Inadequate base preparation is the leading cause of driveway failure. Proper subgrade and base construction ensures decades of reliable service.
The surface layer cannot compensate for poor base preparation. Investing in proper subgrade and base installation pays dividends throughout your driveway's lifespan.
Key Layers at a Glance
- Subgrade: Native soil, compacted to 90% density
- Sub-base: 4-6 inches larger aggregate (when needed)
- Base: 4-8 inches crushed stone, compacted to 95%
- Surface: Concrete, asphalt, pavers, or gravel
Concrete Thickness
Cars: 4 in minimum (5 in recommended). Heavy trucks: 5-6 in. RVs: 6-8 in with rebar. Over 6 in base compacted.
Asphalt Thickness
Base 4-12 in + surface 2-6 in. Cars/SUVs: 6-9 in total. Light trucks: 9 in. Delivery trucks: 9-12 in. RVs: 12-18 in. Class 2 aggregate base, 95% compaction.
Frequently Asked Questions
4 inches minimum for cars. 6-8 in for heavy trucks/RVs with reinforcement.
6-9 inches total for cars (4-6 in base + 2-3 in surface). Heavy vehicles: 9-12 in.
6-8 in concrete with rebar, or 12-18 in asphalt total.
Yes. 6-in concrete can last 30+ yrs vs 15-20 for 4-in under same conditions.
4-6 in light use, 6-8 in standard, 8-12 in heavy. Base as important as surface thickness.
5 in adds 20-25% material cost, significantly improves strength. Consider for moderate climates or future resale.
5-6 in concrete or 9-12 in asphalt total. Reinforcement essential for concrete.
95% density. Compact in 2-4 in lifts. Critical for longevity.