Why the base matters in New Haven
Upland soil above the Missouri River valley is loess over heavier ground, and clay-heavy soils are common across the region. Loess cuts and holds a slope well but erodes fast when water is allowed to run on it. We build ditching and grade first, compact the base in layers, then place asphalt so the freeze and thaw months have less water to work with.
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 New Haven estimate is sized to the soil, the traffic and the drainage on your property.