Asphalt Paving in Fargo, ND

Paving work covers new and replacement asphalt driveways and small lots, built from the subgrade up, and around Fargo the base, more than the surface, sets how long the result lasts, because the city's frost line sits at 52 inches and the clay underneath holds water. Asphalt driveway installation starts with excavating soft soil, building up the gravel base in compacted layers, then spreading and rolling the hot mix, and a paving contractor working on wet lake-plain clay often has good reason to build that base thicker than the textbook minimum. Timing matters as much, because hot mix is easiest to place and compact from May through September here. For a sound older drive that only needs protection, see driveway sealcoating.

Base design is where this area differs from milder places. HomeGuide's figures call for 2 to 3 inches of rolled asphalt on a 6 to 8 inch gravel base for an ordinary home drive, and for heavier loads, 3 to 4 inches of asphalt on 8 to 10 inches of base. The city's deck handout puts the frost line at 52 inches and Minnesota's rule sets footings five feet down in Clay County, so no driveway base reaches below frost. A thicker base instead spreads wheel loads over a subgrade that softens every spring. The soil series named for the city drains very slowly and can hold a water table at the surface, and Fixr adds about $2 a square foot for a heavier base where soils are unfavorable. A geotextile fabric over wet clay and a crown that sheds water off the edges are both worth discussing.

Permits depend on the city and on whether the work touches the street. In Moorhead, a permit is required to install a driveway approach, sidewalk or curb and gutter in the public right-of-way; it costs $60 and is issued only to a contractor with a bond on file or a homeowner who posts a $10,000 bond and shows proof of insurance. West Fargo's code says no one may construct, reconstruct or repair a driveway without a license from the City Auditor, and sets residential driveways at 6 inches thick and at least 9 feet wide at the sidewalk line. Horace publishes driveway standards that draw the residential approach as 6-inch concrete, 9 to 30 feet wide. In Fargo, excavation permits for right-of-way work come from the Engineering Department, the office to check with before a new or widened curb opening is cut.

The paving season is short. Angi notes that asphalt dries and cures well between 50 and 85 degrees, and Hector's normal highs sit inside that band from May, at 69.3, through September, at 70.8, with April and October at about 56 on the cool edge. Hot mix loses heat quickly on a cold base, so compaction suffers early in spring and again in late fall. The frost also has to be out of the ground and the subgrade firm before any base goes in, which in a wet spring can push a May start into June.

Not every worn drive needs tearing out. In HomeGuide's terms, a 1.5 to 2 inch layer of fresh asphalt over the old one suits a drive younger than 15 to 20 years whose foundation is sound and whose surface damage stays under 30 percent. Past 20 to 30 years, or with cracking over 60 percent of the pavement, replacement is the call. Overlays run $1 to $3 a square foot there, and a resurfaced drive lasts 8 to 15 years. An overlay laid on a heaving, waterlogged base simply lets the old cracks work up through the new layer.

New asphalt should not be sealed right away. SealMaster's floor is 30 to 60 days of curing, Angi's guidance runs from 30 days to three months, and HomeGuide recommends waiting around a year, so a drive paved in July or August is better sealed the following summer. Angi says vehicles can use new asphalt after about three days, with no sharp turns while it hardens. On price, HomeGuide puts a new asphalt drive at $5 to $12 and up a square foot, Fixr at $7 to $15, and Angi quotes $8 to $15 to replace one; repair costs sit alongside those on the cost page.