Concrete, terrazzo & stone — restored to original brilliance.
Stonetec brings 25+ years of concrete polishing, terrazzo restoration, and specialty surface expertise to the Preferred Painting team. One company. One call. Full building surfaces from walls to floors.
25 years of precision — now under one roof.
Stonetec was founded in 1999 by Kirk Ringstad with a simple premise: concrete and stone surfaces deserve the same craft attention as any fine finish. For two-and-a-half decades, Stonetec built a reputation across Colorado for polished concrete floors that last decades, terrazzo restorations that look better than the originals, and stone maintenance programs that protect building owners' investments year after year.
In 2024, Preferred Painting acquired Stonetec, and Kirk's team joined ours. Their expertise — concrete polishing and repairs, terrazzo restoration, stone cleaning and sealing, and specialty surface finishing — became part of a full-service commercial surfaces company that no other contractor on the Front Range can match.
One company. One point of contact. The full building envelope, from walls to floors.
Start a project with us"A concrete floor is not a commodity. The prep sequence, the bond grout system, the diamond tooling progression, the densifier chemistry — every variable matters. Do it right and the floor outlasts the building renovation cycle. Cut corners and you're back in three years grinding out a failed system."
Concrete, terrazzo, stone & specialty surfaces
Every service performed in-house by Stonetec-trained specialists.
Diamond-polished concrete floors
Polished concrete is achieved through a progressive sequence of bonded-abrasive diamond tooling, starting with coarse-grit metal-bond diamonds to remove surface damage and flatness irregularities, stepping through intermediate grits, then transitioning to resin-bond diamonds for the final polish sequence. Each step is followed by densifier application — a reactive chemical that hardens the surface and increases abrasion resistance.
The result is a mechanically refined, chemically hardened floor with excellent light reflectance, zero coating system to delaminate, and a service life that outlasts any paint, epoxy, or wax-based alternative.
- Full diamond tooling progression — metal bond through resin bond
- Reactive silica densifier application at each transition point
- Aggregate exposure level matched to spec: cream, salt-and-pepper, or full-aggregate
- Existing coating removal (epoxy, mastic, tile adhesive) prior to polishing
Acid & water-based concrete staining
Concrete staining transforms plain gray concrete into rich, variegated color — adding warmth, depth, and character to floors, walls, and countertops. Stain chemistry penetrates the surface and reacts permanently with the cementitious matrix; it doesn't sit on top as a coating, so it cannot peel, chip, or flake.
Acid (reactive) stains use metallic salts that chemically react with free lime in the concrete to produce earthy tones — browns, tans, rusts, and greens — with the characteristic mottled, variegated appearance. Water-based (non-reactive) stains offer a wider color palette and more consistent results.
- Acid stains: reactive chemistry, irreversible mottled appearance, earth tones
- Water-based stains: broad color range, more predictable results, suitable for brand-color applications
- Acetone dye stains: vibrant, bold colors including custom Pantone-matched tones
- Surface profiling and prep included — no stain applied without proper prep
Concrete repairs, grinding & surface prep
Before any decorative or protective concrete system is applied, the substrate must be sound. Cracks, spalls, delaminated sections, high spots, and contaminated surfaces will telegraph through any coating or polish and become visible failures within months. Stonetec's concrete repair services address structural and cosmetic defects before work begins — and we document every repair.
- Crack repair: routing, vacuum cleaning, and epoxy or polyurethane injection
- Spall repair: saw-cutting, chipping to sound concrete, bonding agent, and cementitious patch
- Concrete grinding: trip-hazard removal, high-spot leveling, surface profiling
- Shot blasting: mechanical surface profiling for coating adhesion — removes laitance, curing compounds
Terrazzo polishing & restoration
Terrazzo is among the most durable floor systems ever developed — a composite of marble, glass, or granite chips set in a cementitious or epoxy binder, ground to a smooth, polished surface. Its service life is measured in decades, but only if properly maintained and restored when worn.
Our terrazzo restoration process returns worn, stained, or dull terrazzo to its original luster. We repair chips and cracks, replace damaged divider strips, grind through surface damage, and progressively polish to achieve the specified sheen level.
- Chip and crack repair — marble, granite, and glass chips matched to existing mix
- Divider strip replacement — aluminum, brass, or zinc strips reset or replaced
- Full grinding sequence — diamond abrasives from 30-grit through 1200-grit
- Final polish and sealant application — sheen levels from matte to high-gloss
Natural stone cleaning, polishing & sealing
Marble, granite, limestone, travertine, slate, and engineered quartz surfaces in lobbies, conference rooms, and restrooms require specialized cleaning, polishing, and sealing protocols. Stone is a natural material with distinct mineral composition and porosity — the wrong cleaner, the wrong abrasive, or the wrong sealer can permanently damage it.
We use diamond-abrasive honing and polishing to remove etching and scratches, then apply penetrating sealers to protect against staining and moisture intrusion. We never use acidic cleaners on calcium-based stone (marble, limestone, travertine).
- Marble restoration — acid-etch removal, scratch removal, polishing to match existing
- Granite honing and polishing — diamond pad progression through multiple grits
- Limestone and travertine filling — pitting repaired with color-matched epoxy
- Sealing — impregnating sealers for stain and moisture resistance
Specialty coating & finishing systems
Stonetec's specialty finishing services add visual texture, durability, and architectural interest to concrete and masonry surfaces — walls, columns, countertops, and feature elements. These systems are more than decorative; they also provide protection and extend substrate lifespan.
- Acetone stain applications — vibrant, penetrating color for concrete
- Polish overlays — thin-mil cementitious toppings for existing concrete
- Trowel cove base installation — integral coved base for commercial spaces
- Masonry coatings — elastomeric and breathable systems for exterior concrete
Assessment through final inspection
Every Stonetec project follows the same proven process — from substrate testing to documented handoff.
Substrate Assessment
We test moisture vapor emission, pH, flatness, and bond strength. Documented in writing before any work begins. No assumptions.
Fixed-Price Quote
Line-item proposal with product specs, prep scope, and total cost. No "unexpected" substrate-discovered charges after work starts.
Prep & Application
Repairs, grinding, staining, polishing, or sealing — performed in-house by Stonetec specialists. Daily progress updates with photos.
Final Walkthrough
Complete inspection with your team. Product data sheets, test results, and completion certificate provided. We don't close the job until you've signed off.
Ready to transform your floors?
We'll assess your substrate, recommend the right system, and return a fixed-price quote within one business day.