Why the base matters in Darmstadt
Uplands east of the Mississippi bluffs in this county are blanketed in thick windblown loess silt. Silt packs tight and drains slowly, so water that gets under pavement stays there, and freeze-thaw winters lift it from below. We grade for runoff, dig out soft subgrade and compact clean rock in layers so the base stays firm.
Before you sign anything, get the base depth and the compacted asphalt thickness on paper. Two bids that look far apart are often just two different pavements.
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 Darmstadt estimate is sized to the soil, the traffic and the drainage on your property.