Steep Driveways in Colorado Springs: Traction, Drainage and Sealer
A 20 percent grade changes how water runs, where ice forms and how a coat of sealer should be mixed, and both the city and Woodland Park write limits into code.
What the codes allow on a hillside lot
Colorado Springs writes driveway slopes into its zoning. Inside the hillside overlay, City Code 7.2.610 says individual driveways should have a maximum slope of 20 percent and shared driveways 15 percent, which lets a 100-foot drive climb 20 feet. When a driveway doubles as required fire department access, the rule tightens to at least 12 feet wide and no steeper than 12 percent. The same section limits cut and fill slopes to 4 feet high, in no more than two tiers, so hillside lots are expected to follow the land rather than be graded flat.
Up Ute Pass the numbers are stricter. Woodland Park's single-family driveway standards cap grades at 6 percent inside the public right-of-way and 17 percent from the right-of-way line to the garage, and ask for fire apparatus turnarounds of 8 percent or flatter. An older Colorado Springs Fire Department access packet, revised in 2000, set private driveway grades at 10 percent, with 12 allowed in the hillside overlay. A drive built near any of those limits is a different sealing job from a flat two-car pad.
Why sand belongs in the sealer
Fresh sealer is a smooth film until something roughens it. SealMaster says clean silica sand belongs in the mix because it provides slip resistance, helps the coat dry and adds durability, and its MasterSeal specification calls for 300 to 500 pounds of sand per 100 gallons of concentrate. On a flat drive the sand is a modest improvement. On a 15 or 20 percent grade, where the airport station records 157 nights a year at or below freezing, it decides whether a boot sole holds on a frosty morning.
Application changes on a slope as well. Sealer is meant to go on thin, in two coats; a gallon of MasterSeal concentrate, properly mixed, covers about 100 to 120 square feet per coat, and piling it on heavier adds no protection. On a grade, heavy coats run toward the low end and puddle against the garage slab or the street apron, where they cure slowly and track onto shoes and tires. Working from the top of the drive down toward the street keeps the crew off finished material and leaves them a way out.
Sand of the wrong kind causes trouble too. Traction sand from the street, the sand and salt mix the city spreads on arterials and grit washed down from landscaping all collect at the bottom of a grade over the winter. Swept up before sealing, it does no harm. Sealed over, it leaves a weak, gritty skin that flakes away from the asphalt beneath, which is why a thorough blow-off matters more on a sloped drive than on a level one.
Water moves faster on a grade
A steep drive works as a channel. Everything that falls on it, and on the roof and yard above it, heads downhill across the asphalt, and at the airport 8.68 of a normal 16.54 inches of precipitation comes in June, July and August, with July averaging 1.8 days of half an inch or more. Water moving that fast carries sand, scours loose stone from an aged surface and cuts at unsupported edges. Where it slows, at the garage slab, the apron or a low corner, it drops what it carried and soaks in.
The fixes are mostly about direction. Woodland Park requires driveway runoff to reach curb and gutter or another improved drainage-way rather than the street, and culverts under driveways at least 18 inches across. In the city, Code 12.4.1304 already bars sprinklers from sending water across a driveway into the gutter. A trench drain at the bottom of the grade, downspouts routed away from the pavement and soil graded to fall away from the edges keep water off the parts of the drive most likely to fail. On swelling clay that also protects the subgrade, as the expansive soil guide explains.
Ice, shade and the freeze line
Slope and aspect decide where ice forms. At the airport, 157.1 nights a year reach 32 degrees or colder, but only 22.4 days stay frozen all day, so on most winter days the sun melts snow on a drive and the water refreezes after dark. A drive that faces north, or sits in the shadow of a house or a hillside, gets less of that afternoon melt, so water draining from above can run onto it and freeze there. Snow lies an inch or more deep on only about 29 days a year at the station, but shaded grades hold it longest.
The city plows residential streets only after at least 6 inches of snow, so on a hillside street the packed snow and slush at the top of a driveway can stay for days. The city suggests clearing a pocket to the right of the driveway so the plow blade drops its load there rather than across the entrance. On the drive itself, a plastic-edged shovel, or a snowblower with its skids set high, avoids gouging the sealer, and any deicer should be one the sealer's label allows. Sand in the coat gives the surface its grip; grit and deicer handle the rest.
Repair order for a steep drive
Sequence matters more on a grade. Start with drainage, because water running down the drive will undo any repair in its path. Then fill cracks with hot-pour material in the fall, when they are widest; on a slope, open cracks act as small gutters that carry water along the drive and into the base. Patch failed sections in early summer once the base has dried, and seal last, in July or August, when the airport's normals show only one or two nights a month at or below 50 degrees. The pages on crack filling and driveway sealcoating in Colorado Springs cover timing and prices.
Ask two questions of any bid for a steep drive: how much sand goes into each coat, and how the crew will keep material from pooling at the bottom. A third question, about where water will go once the work is done, often matters more than either, because the drive will spend far more of its life shedding storm water than carrying cars.
Have a steep drive that needs work? Describe the grade and the cracks on the quote form.
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Quick Answers
Can a steep driveway be sealed in one day?
The coating can, if the drive is modest in size and the weather cooperates, but the cure needs another full day. Sealer instructions call for 50 degrees and rising for at least 24 hours with no rain, and SealMaster asks for 24 hours after the final coat before traffic. On a steep drive the second coat goes on once the first has dried, working from the top down, so the car stays at the bottom or on the street until the next evening.
Is a steep asphalt driveway harder to maintain than a flat one?
It takes more attention, mostly because water and grit move faster on it. Runoff scours the surface and edges, winter sand collects at the bottom, and shaded sections hold ice. The maintenance itself is the same list, drainage, crack filling, patching and sealing, done with more care: sand in every coat, thin applications, and a thorough cleaning of the low end before each coat.
Where should snow go when clearing a steep drive?
Downhill and off to the side, onto the lawn or beside the curb, and never into the street. Manitou Springs writes that into its rules, asking owners to clear driveway entrances within 24 hours after a storm and keep the snow out of the street. Piles at the top of a drive melt onto the pavement below and refreeze overnight, so on a slope the lower edge of the lot is the better place for them.
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