Crack Filling in Madison, WI

Crack filling is the job of blowing out each crack in the asphalt and sealing it with a flexible, rubberized hot-pour material so water cannot get to the base, and on local driveways it is the repair that keeps a small problem from becoming a base problem. The airport normals count about 87 freeze-thaw days a year, roughly 19 of them in March and 15 in November, and each one lets water sitting in an open crack freeze, expand and pry the crack a little wider. On the silt loam soils common in Dane County, water that gets below the pavement also feeds frost heave. Filling a crack does not hide it; it seals it, so the drive stops drinking water through the gap.

Cracks here follow the frost. Pavement Interactive's frost-action reference lists three conditions for heave: soil with a significant share of fine particles, freezing temperatures that reach into it, and a supply of water. Dodge silt loam, the soil whose official type location lies northeast of Sun Prairie, supplies the first, the climate supplies the second, and an open crack supplies the third. In spring the ground thaws from the top down, so meltwater that went in through a crack is trapped above still-frozen soil and the base loses bearing capacity. That is how a crack that looked minor in October becomes a sunken, webbed spot by April.

Width decides the treatment. The PASER manual from the UW-Madison Transportation Information Center, whose ratings feed Wisconsin's local road inventory, recommends sealing cracks wider than a quarter inch to keep water out and assigns routine crack filling to pavement rated 7. On a driveway, hairline cracks are generally covered by the sealer itself, while quarter-inch and wider cracks are blown out, dried and packed with a rubberized material that stays flexible through the cold. Very wide or sunken cracks signal base movement and belong on the asphalt patching list instead.

This climate offers two good windows for crack repair. Fall work, after the leaves are down and before hard freezes set in, closes cracks ahead of November's roughly 15 freeze-thaw days; the airport's median first 28-degree night comes around October 17. Spring work, once the pavement is dry in April or May, catches what March opened. Hot-pour filler needs dry, clean cracks, so rain pushes the schedule. When sealing is planned for the same season, the filling goes first so the material can firm up before sealer covers it.

Local public works departments treat crack filling as routine too. Verona's street department lists crack filling, chip sealing and joint sealing among its asphalt repairs, and the PASER manual recommends updating pavement ratings every two years so small distress gets caught early. Parking lots follow the same logic at a larger scale, which is why crack work anchors every maintenance plan described on this site.

HomeGuide prices crack filling from 50 cents to $3 a linear foot and Angi from $1 to $3, with many standalone crack filling jobs totaling $100 to $400. The footage matters more than the number of cracks, so ask for a measured linear-foot count in the bid. The cost page shows how crack work fits into a full sealing estimate.