Sealcoating Des Moines
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Asphalt Paving and Replacement in Des Moines, IA
Asphalt paving here means a new or replacement driveway: excavating to firm ground, building a compacted stone base, and laying hot mix in rolled lifts, and on Des Moines Lobe till the base does most of the work. A frost-susceptible soil, water and subfreezing weather are the three ingredients of frost heave, and a Polk County lot supplies all three unless the design keeps water out from under the pavement. Asphalt driveway installation is also the job on this site most likely to need a city permit, because a new or widened drive crosses the public sidewalk and meets the curb. A paving contractor should cover that permit, the utility locate and the base design in the bid.
$5 - $15 per sq ft new or replaced; $3 - $7 per sq ft for an overlay · full pricing guide
HomeGuide's residential standard is 2 to 3 inches of asphalt over 6 to 8 inches of compacted gravel base, and the base figure deserves its upper end here. Clarion till is loam with 18 to 28 percent clay, Webster soils on the flats carry 29 to 39 percent clay near the surface and stay saturated close to it in wet seasons, and both sit far above the Casagrande frost-susceptibility threshold. Fixr notes that a quality stone base on unfavorable soil adds about $2 per square foot, money well spent on Webster or Okoboji ground. The subgrade should be proof-rolled, soft spots dug out and replaced with stone, and the finished grade set to shed water away from the house and the garage slab.
Permits start at the property line. Des Moines Engineering runs plan review, permitting and inspection for construction in the right-of-way, which the city defines as roads, sidewalks and utilities, so a new approach, a widened curb cut or a replaced walk crossing needs city sign-off. A residential sidewalk permit costs $40 through the online portal, and the city's walk standard treats a three-quarter-inch vertical separation as a defect, which matters where new asphalt meets old concrete. Suburbs run their own processes: Ankeny asks for at least five business days to review a right-of-way permit, Urbandale uses the shared Metro ROW Permit Application, and Johnston requires a bond, proof of liability insurance and construction documents. Any excavation needs an 811 locate request at least 48 hours ahead, and private lines are not marked by Iowa One Call.
The paving season follows the thermometer. Iowa DOT's specification for flexible pavement sets minimum surface temperatures by lift: 50 degrees for a 1-inch hot-mix surface course, 45 for 1.5 inches, and 40 for 2 inches or more, and it holds hot mix between 225 and 330 degrees from the plant to the grade. At the airport station, normal lows reach 41.1 degrees in April and fall back to 43.0 in October, so thin surface lifts belong in the warm months and a late-October job should use a thicker lift. The same specification sets a 1.5-inch minimum compacted lift for a half-inch mix, a useful check on any bid that promises a thin top course.
An overlay lays new asphalt over the old surface after cleaning, patching and a tack coat, and it only works when the base underneath is sound; over wet, settled till the old crack pattern tends to reflect through. Angi prices overlays at $3 to $7 per square foot against $8 to $15 for full replacement, with removal of the old surface adding $1 to $2, and HomeGuide's range for new asphalt is $5 to $12 or more. New pavement then needs time. HomeGuide says to wait 24 to 48 hours before parking and about a year before the first seal, and SealMaster sets 30 to 60 days as the bare minimum cure. The driveway sealcoating page picks up from there.
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When a Des Moines driveway is past repair
Sealing and patching extend a drive's life only while the base holds. These signs suggest it no longer does.
- Alligator cracking across most of the surface
- Several low spots that hold water after every rain
- Patches covering a large share of the drive
- Edges broken away along both sides
- Mud or fine soil pumping up through cracks in spring
- Heaving at the garage slab or the sidewalk every winter
Two or more of these usually mean an overlay would inherit the failures. Pricing a full replacement alongside it gives an honest comparison.
Overlay, replace, or replace and widen
The condition of the base decides between the first two; the curb and sidewalk decide the third.
Overlay
The surface is cracked and tired but the base is firm, with no pumping or deep depressions. Patch the weak spots full depth, tack coat, and add a new surface for roughly half the cost of replacement.
Full replacement
Fatigue cracking, standing water and heaving show a wet or failed base. Remove the old pavement, dig out soft till, build 6 to 8 inches of compacted stone, and pave in two lifts.
Replace and widen
A wider drive or a second curb cut adds right-of-way work: city review of the approach, a sidewalk permit for any panels crossed, and an 811 locate before digging.
Asphalt Paving and Replacement FAQs
Does a new driveway approach need a permit in Des Moines?
Yes. The approach, the curb cut and any sidewalk panels it crosses sit in the public right-of-way, and the city's Engineering department reviews, permits and inspects construction there. Replacing a public sidewalk section takes its own residential permit, applied for online by the owner or the hired contractor. Suburbs handle this through their own engineering offices, so a crew working in Ankeny, Urbandale or Johnston follows that city's process instead.
How thick should a new asphalt driveway be on clay soil?
HomeGuide's residential guideline is 2 to 3 inches of compacted asphalt over 6 to 8 inches of compacted gravel base. On Des Moines Lobe soils, which run roughly 18 to 42 percent clay depending on the series and the layer, the base belongs at the thick end of that range, soft spots should be dug out and replaced with stone, and the surface should be graded to shed water. If the asphalt goes down in two lifts, each should meet Iowa DOT's minimum compacted thickness for its mix size, 1.5 inches for a half-inch mix.
Can an old driveway be paved over instead of torn out?
If the base is firm, yes, and it usually costs less: Angi puts overlays at $3 to $7 per square foot against $8 to $15 for replacement. The old surface is cleaned, broken areas are patched full depth, a tack coat goes down and new asphalt goes on top. Where the old drive has sunk, pumps water in spring or is covered in fatigue cracking, the overlay inherits those failures within a few winters, and replacement is the better spend.
How late in the fall can asphalt be laid in central Iowa?
Later than sealer, but not by much. Iowa DOT's specification allows a 2-inch or thicker lift at a 40-degree surface temperature, while a 1-inch surface course needs 50. October's normal low at the airport station is 43.0 degrees and November's falls to 30.5, with the median first freeze on October 17. Driveway paving therefore tends to wrap up by late October, and a November pour depends on a warm spell and a thick lift.
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