What's under a Shipman driveway
Winters here bring repeated freezes and thaws, and summers are hot and humid. Both are hard on asphalt that sits on a weak or wet base. Clay-heavy soils common around St. Louis drain slowly, so we grade every surface for runoff, remove soft material, and compact rock in layers before any asphalt goes down.
A cheap bid usually gets cheap somewhere you cannot see. Ask what depth of stone goes down, how thick the asphalt is after rolling, and who fixes it if water still stands.
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 Shipman estimate is sized to the soil, the traffic and the drainage on your property.