Built for Cahokia Heights's ground
The county's western floodplain, the American Bottom, is mostly protected by a levee and drainage canal system, and the ground under it is deep river-laid clay, silt, sand and gravel. It holds water. A wet base under asphalt lifts and cracks through freeze-thaw winters, so we grade for runoff and compact clean rock before paving.
When you compare bids, ask each contractor for three numbers in writing: the compacted asphalt thickness, the base depth, and what happens to the water. Those three decide how long the surface lasts.
Compacted asphaltTypically 2 to 3 in. for a car drive
Stone baseTypically 4 to 8 in., compacted
Drive on itUsually 2 to 3 days, longer in heat
First sealcoatTypically 6 to 12 months after paving
Typical ranges. Your Cahokia Heights estimate is sized to the soil, the traffic and the drainage on your property.