Sealing concrete is the easiest home maintenance job to put off. Nothing is broken. Nothing is leaking. The driveway looks the same today as it looked last year.
That is exactly why it gets skipped, and why so many driveways in Colorado Springs go from fine to pitted in the space of about four winters.
The damage does not announce itself. Here is what is happening while nothing appears to be happening.
Concrete is not solid
The thing to understand about a slab is that it is porous. Concrete is full of tiny capillaries running down from the surface. On a new, sealed slab they are closed. On an old, unsealed one they are open.
Everything that damages concrete gets in through those pores. Nothing gets in through the surface of a sealed slab, which is the entire job the sealer does.
What gets in, in this market
Water. It soaks in, it freezes overnight, and it expands about nine percent when it does. That expansion pushes against the concrete from the inside. Then it thaws the next afternoon and the water moves deeper. Colorado Springs runs that cycle more than a hundred times a year. Each pass opens the concrete a little more, which is how a hairline crack becomes a wide one and how the top layer starts to let go. The freeze-thaw post covers the mechanics.
Magnesium chloride. This is the local one. Mag chloride goes on the roads all winter, comes home on your tires, and drips onto your driveway and garage floor. It works into the pores and it does not leave. It holds moisture against the concrete, which feeds the freeze-thaw cycle, and it attacks the cement paste holding the aggregate together. The white haze that will not sweep up is mag chloride. So is the dusting.
UV. At above 6,000 feet with better than 240 sunny days a year, sun does more to an exterior surface here than most people expect. It breaks down whatever is on top and it fades color.
Oil and fuel. They stain permanently on open concrete, because they go in rather than sitting on top.
What it looks like as it goes
The progression is predictable enough to put stages on it.
Stage one, surface only. The slab is sound and the finish is dull or slightly discolored. A clear sealer or a color coating stops it here. This is the cheap moment and the one people sail past.
Stage two, pitting and dusting. Small holes appear across the surface and it sheds a fine powder when you sweep. The top layer has started letting go. Still fixable, but now the repair comes first.
Stage three, spalling. The top layer flakes and pops off in patches, leaving rough exposed aggregate. This is resurfacing territory: repair, then a new surface.
Stage four, structural. Cracking goes through, sections move relative to each other, edges crumble. Nothing applied to the top holds, because the slab under it is moving. Replacement.
The distance between stage one and stage three in Colorado is shorter than people think. Unprotected concrete moves through it in a handful of winters.
What sealing does not fix
Worth being straight about. Sealing is prevention, not repair.
A sealer over cracked or spalling concrete covers the damage temporarily and does nothing about the moisture already getting in underneath. The underlying problem carries on, out of sight, and you have paid for a finish that will fail with the concrete beneath it.
If the slab is past stage one, the repair comes first. Any company that will seal over visible damage without saying that is selling you a year.
The maintenance version
For concrete that is still sound, the whole thing is a schedule.
Seal it. Reseal it before the last one has given up rather than after. Refresh intervals depend on exposure: a driveway in full sun with vehicle traffic wants it sooner than a shaded, covered patio. We will tell you what yours is looking at.
Fall is the natural moment for it in this market. September and October give reliable daytime temperatures and nights that are still above freezing, and you go into the winter protected rather than waiting until spring while another season of mag chloride goes in. The best time of year to coat or seal post has the month-by-month.
If you want protection and a different look at the same time, that is color sealing. If you want the concrete to stay the color it is, that is clear sealing.
FAQ
How often should I reseal in Colorado Springs?
Every few years for most exterior surfaces, and sooner on a driveway in full sun and heavy use than on a shaded patio. The honest answer depends on your exposure, which is one of the things we check at the estimate. The rule that matters more than the interval: reseal before the old one has given up, not after.
Can I seal it myself?
You can. The two things that separate a job that lasts from one that does not are surface preparation and product choice, and both are easier to get wrong than they look. A sealer over a surface that was not properly cleaned and profiled will not bond, and consumer-grade product at this elevation gives up faster than people expect.
My driveway already has cracks. Is sealing still worth it?
Not on its own. Sealing over cracks leaves the moisture path open underneath and hides the problem while it carries on. Depending on how far it has gone, the answer is crack repair first and then seal, or resurfacing. We will tell you which one you are looking at.
Does sealing stop mag chloride for good?
It stops it getting into the concrete, which is where the damage happens. Salt sitting on top of a sealed slab is a cleaning job rather than a structural one. Rinse the driveway down when you can through the winter and the sealer handles the rest.
Is it too late in the year to seal?
Through October, usually not. The limit is overnight freeze risk, because a sealer needs time to cure before it takes one. November is where it gets difficult here. If you are reading this in fall, this is the window rather than the thing to put off until spring.
Not sure what stage your concrete is at? Elite Concrete Coatings gives free on-site assessments across Colorado Springs and the Front Range, and we will tell you when the answer is that it is fine. Call 719-639-0643 or request an estimate.
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We'll come out, look at it, and tell you what it needs. Free, written, no pressure.
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