Denver back yards work harder than the weather suggests. People eat outside in April, run a fire pit through November and treat the patio as another room. Meanwhile the concrete under all of it is taking a beating nobody watches. A brick bungalow in Washington Park or Congress Park usually has an alley apron, a detached garage slab and a back patio, all poured decades apart, all scaling at different rates and all patched with something a previous owner mixed in a bucket.

Resurfacing works with what is there rather than against it. Natural stone aggregate is pre mixed with a clear UV stable binder and hand troweled over the prepared slab, giving a seamless, fully permeable finish rated to hold up to 40,000 lbs at driveway depth over a sound base. No demolition, no dumpster on the alley, no cure period eating a month of a season that is already short. Where the old concrete is sound, it becomes the base instead of landfill.

Resin Rock supplies the binder and the batch tested aggregate and trains the approved installers laying it from Berkeley and Sloan's Lake across to Park Hill, Central Park and Green Valley Ranch. Blend choice gets real attention in this city, because a surface at a mile above sea level takes more ultraviolet than the same surface at the coast, and because Denver homeowners tend to know exactly what they want the back yard to look like.

It is the cycling, not the cold. A clear January day here can put a south facing slab in full sun well above freezing by noon and back below it by eight that evening. Every one of those crossings that happens with water sitting in the surface pops a little more material loose. That is why Denver driveways scale in strips, worst where the car parks and worst again on the sunny half, while a shaded north side of the same pour still looks reasonable at twenty years old.

Magnesium chloride finishes the job. It goes down on the roads because it keeps working when rock salt has quit, and it comes back up your driveway on four tires whether or not you use anything yourself. Chloride is chemically hard on concrete and it makes the surface freeze and thaw more often, not less. Then add altitude. Ultraviolet intensity climbs as you go up, and acrylic sealers, stains and colored coatings chalk out here noticeably faster than the label ever suggested they would.

Resin bound is a mixed-on-site surface. Aggregate and a two part UV stable resin go into a forced action mixer at an exact ratio, and the resulting blend is troweled over your existing concrete at depth. It cures into a single seamless, porous sheet.

People confuse it with resin bonded, and the two behave nothing alike. Bonded work scatters dry stone onto a resin coat, so the surface is textured, sheds loose grit and holds water on top. Bound work carries the resin all the way around every stone, which is what makes it flat, fixed and free draining.

The practical result in Denver is that you keep your slab, lose the cracked and stained surface on top of it, and gain something that handles rain by absorbing it rather than pushing it toward your foundation.

You are choosing stone, not paint, so the finish has depth to it rather than a flat printed color. Resin Rock stocks more than 30 blends of quartz, granite, marble and basalt, all screened for consistent size and shape so batches match. That consistency is what stops a driveway looking patchy where one day's work meets the next.

Think about how the surface gets used before you think about how it looks. Barefoot areas want light quartz or marble. Parking areas want something mid to dark that forgives a tire mark. Anything next to the house usually looks best picking up a tone already in the brick, render or stone.

For feature work, Glow Rock from Glow Surfaces charges in daylight and glows softly after dark. It works as a path edge, a pool surround border or a driveway inlay rather than a whole surface.

Fifteen years and up is a realistic life on a properly installed surface, and looking after it is mostly a matter of keeping the pores open. Leaves, grass clippings and dust are what clog a permeable surface, so a blower or a stiff yard brush every few weeks does most of the work. A wash down once or twice a year handles the rest.

When you jet wash, use a wide fan tip and keep it a foot back. A turbo nozzle held close will strip resin off the top of the stone, and so will a wire brush or a strong solvent. Warm water and a soft brush deal with almost every spill. Nothing grows up through the surface, but seed can root in debris left sitting on it.

If a section ever does get damaged, resin bound is repairable. An approved installer can cut out and relay a patch in the same blend rather than replacing the whole surface.