Crack Filling in Duluth, MN

Crack filling closes the openings in asphalt with a flexible, usually hot-poured rubberized material so water cannot reach the base, and in Duluth it earns its keep because March and April alone account for 32 of the airport's yearly freeze-thaw days. That is when snowmelt runs down the hill, pours into every open crack in the afternoon and freezes again at night. Each cycle pries the crack a little wider and softens the gravel beneath it. Filling in late summer or early fall means the cracks are shut when the spring melt arrives, and it comes ahead of any seal coat on the driveway, since sealer cannot bridge a true crack.

Not every crack is the same problem. A long crack parallel to the edge usually means the side of the driveway has lost support, often where pavement meets lawn, a ditch or a retaining wall. Straight cracks across the width open and close with temperature. A web of small connected cracks, called alligator cracking, means the base underneath has failed, and filler will not hold there for long. Hillside lots add a fourth kind: a crack along the line where the driveway crosses from cut rock onto fill, since the two support the pavement differently.

Hot-pour rubberized sealant is melted in a heated kettle and placed into cleaned, dry cracks, where it stays flexible through temperature swings. Cold-pour products from a jug are easier for owners to apply but generally do not last as long. Preparation matters as much as the material. Winter sand has to be blown or brushed out of each crack, the crack must be dry, and wider cracks may be routed to give the filler a clean reservoir. On a sloped drive the filler is struck off level so it does not leave a ridge for a shovel to catch.

Timing in Duluth runs against the habit of doing everything in spring. Asphalt contracts in the cold, so cracks are widest in winter and narrowest in summer heat; filler placed in cool fall weather goes in with the crack fairly open and is squeezed in summer rather than stretched hard in winter. NOAA's normals show 11.0 freeze-thaw days in October and 13.4 in November, which makes September and the first days of October the practical window. Crack repair in May and June still pays after a hard winter has opened new cracks.

Crack work is sold by the running foot: $0.50 to $3.00 a foot in HomeGuide's 2025 guide and $1 to $3 in Angi's 2026 guide, and small jobs usually carry a minimum service charge. Measuring the total footage with a tape before calling makes quotes comparable. Sections where cracks have joined into a web are priced as asphalt patching instead, since they need the broken area cut out and rebuilt.