Highlands Ranch Exposed Aggregate Concrete

Exposed aggregate is the finish people choose once they've thought about maintenance. The stone in the mix gets uncovered while the concrete is young, so what you walk on is rock rather than cement paste. That surface grips wet, grips icy, and camouflages leaf stain, mud, and pollen better than any smooth finish will. Around a pool or on a sloped front walk, it's frequently the correct answer before anybody talks about looks.

It also runs above a broom finish on the estimate, and homeowners deserve to know exactly where that extra money goes. Not into markup. Into a narrower pour-day window, extra bodies on site, stone that sometimes has to be ordered instead of scooped from the standard load, and a wash step that has to be handled cleanly so slurry doesn't end up in your beds. Here's how each of those pieces moves the number.

Where the money actually goes

Start with the rock itself. The cheapest version uses whatever round river stone is already riding in the local mix, and honestly it looks good: warm browns, tans, a little gray, familiar to anyone who has walked a Colorado sidewalk. Step up and you're into select stone, ordered by size and color, sometimes broadcast by hand across the fresh surface and worked in by a crew member on knee boards. That's a different job with a different labor line, and it's why two exposed aggregate quotes can sit a long way apart.

Depth of exposure is the second lever. A light open of the surface is quick and forgiving. A deep exposure, where the stone stands proud and reads almost like a creek bed, wants a chemical retarder brushed on, a controlled dwell, and considerably more washing and brushing before anyone goes home. More product, more hours, more water to manage. Neither is better. They're different surfaces, and we bring samples of both.

What moves the number on an aggregate pour

Wash day is the whole job

Everything about this finish comes down to one window on pour day. Wash too early and the stone rolls out of the paste and leaves pockmarks. Wash too late and the paste has locked, and now you're grinding or blasting to recover a surface that should have taken twenty minutes. Our crew leads read that window by fingernail and thumb, not by clock, because it moves with air temperature, wind, sun angle, and how thirsty the base was.

Which is why this finish is fussier about weather than plain gray. Dry Front Range wind pulls surface moisture fast and slams the window shut early. A cloud bank stretches the afternoon into evening. May, June, and mid-September hand us the steadiest conditions. July and August work, but we start at first light and watch the cells over the foothills, because hard rain landing before the wash is done cuts its own channels through the paste. In deep winter we reschedule. Cold slows the set, rinse water freezes where it lands, and the stone comes out uneven.

Around town we pour this finish in two situations. In Eastridge and Southridge it replaces a slick original walk that got dangerous once it iced. Out in BackCountry and The Hearth it goes in as part of the first landscape plan, matched to stone already on the house.

Where this finish earns back what it costs

• Pool surrounds and hot tub aprons, where bare wet feet need something to hold
• Sloped front walks that turn into a hazard the first morning they glaze over
• Shaded north-side paths under the trees, which stay damp for weeks
• Wide driveways where a smooth field would show every oil drop and tire mark
• Entry pads that catch mud all spring and never look dirty anyway
• Any surface you would rather sweep twice a year than scrub twice a month

The question we hear on every bid is whether it's worth the difference over a broom finish. Our answer depends on the slope. Flat back patio, either one serves you fine. Anything pitched, anything wet, anything people walk barefoot on, and the stone pays for itself the first winter nobody falls.Our crew lead, after the walkthrough