Quick answer: when you compare epoxy garage floor companies in Denver, ask questions that test six things: how they prepare the slab, which exact products they use, who does the work, what insurance backs it, how long the floor needs before you can drive on it, and what the warranty excludes. The most useful single question is how they will profile the concrete and how they will show you it was done, because prep decides whether the floor lasts and it is hidden under the finished coating.
Denver has plenty of installers, and a quote tells you very little about the one thing that matters. Our own epoxy garage floor installs are built around the answers to these same questions, so we wrote them down with the response that should worry you next to each one. If you are still weighing a kit against a professional, our comparison of DIY against professional garage epoxy covers that decision first. Below, each group of questions has a short explanation, then the answer that should make you keep looking.
Prep Questions: How Will You Profile the Slab and How Will You Prove It
Ask how the slab will be profiled and how you will see proof, because grinding to the right profile is the step most often skipped and the one a finished floor hides. Three questions cover it.
1. How will you profile the concrete? A professional answer names diamond grinding, sometimes shot blasting, and a target profile in the CSP 2 to CSP 3 range for a garage system. Epoxy locks into that texture, and without it the coating sits on the surface as a film. The answer that should worry you: acid etching, "power wash and etch," or "our primer bonds to anything." Etching usually reaches only about CSP 1 and leaves residue that has to be neutralized.
2. How will you show me it was done? Ask for photographs of the slab after grinding and before the primer goes on. Ground concrete looks uniformly dull and slightly open, and you can feel the texture with a flat palm. The answer that should worry you: no photos, or a floor that still shows gloss, old sealer sheen, or paint flecks. Our guide to epoxy floor prep and concrete surface profile explains the profile numbers if you want to check a contractor's answer against the standard.
3. Do you test the slab for moisture, and what do I get from it? The answer should be a measured result, either a calcium chloride test or in-slab relative humidity probes, with the reading written down. The answer that should worry you: "we never need to," or a plastic sheet taped down with no number recorded. Our guide to testing slab moisture before coating covers the numbers that trigger mitigation.
| Prep Method | Typical Profile | What You Can Check Yourself |
|---|---|---|
| Diamond grinding | CSP 1 to CSP 3 | Uniformly dull, slightly open surface; photos before primer |
| Shot blasting | CSP 3 to CSP 5 | Even texture; uncommon in a home garage |
| Acid etching | Usually CSP 1 | Surface looks barely changed; chalky residue possible |
| Pressure wash only | No profile | Old gloss, sealer sheen, or paint still visible |
Material Questions: Which Product, Which Data Sheet, How Many Coats
Ask for the product name for each coat, the data sheet for it, and the number of coats, because specific answers can be checked and vague ones cannot. Three questions cover it.
4. Which exact product will you use for each coat, and can I have the data sheet? A real installer names a product and code for the primer, the body coat, and the topcoat, and hands over the sheet. The answer that should worry you: a brand name with nothing else, or "professional grade." Every legitimate coating has a published data sheet. If you want to know what to look for on one, our guide to verifying an epoxy contractor's materials walks through solids content, spread rate, and pot life, so we will not repeat it here.
5. How many coats and stages does the system have? A durable garage system is typically three stages: a primer, a body coat with flake broadcast into it if you are using flake, and a protective topcoat. The answer that should worry you: a single coat, which is a paint job and will not perform like a coating system.
6. Is the topcoat UV-stable? At Denver's altitude, sun reaches the first several feet inside the garage door and aromatic clear coats turn amber and chalk. The topcoat should be aliphatic, and the data sheet will say so. The answer that should worry you: "a clear epoxy topcoat" with no mention of UV, or no data sheet to check.
Crew Questions: Your Employees or a Subcontractor, and Who Is on Site
Ask whether your floor will be installed by the company's own employees or by a subcontractor, and who will supervise, because that decides who is accountable if something goes wrong. Two questions cover it, and our guide to hiring a Denver epoxy contractor goes deeper on in-house crews against subcontractors.
7. Are the installers your employees? Subcontracting is not automatically a problem, but it changes who holds the warranty and who answers the phone. Our crews are in-house and we do not use subcontractors, and you should expect any company to say plainly which model they use. The answer that should worry you: "we use crews as needed" with no further detail.
8. Who supervises on site, and has this crew installed this specific product before? Coatings are sensitive to mixing ratios, temperature, and timing, so experience with the exact product matters. Ask for the answer in writing alongside the quote. The answer that should worry you: no named supervisor, or a crew that is trying the product for the first time on your floor.
Insurance, Licensing and What to Actually Verify in Colorado
In Colorado, verify insurance rather than a license, because the state does not issue a statewide flooring contractor license and local rules vary. What you can check everywhere is general liability coverage, workers' compensation, and the business's registration. Three questions cover it.
9. Can you send a certificate of insurance directly from your insurer? A certificate that comes straight from the insurer or agent, with your name as certificate holder, cannot be altered. The answer that should worry you: a photo or photocopy handed over by the contractor, or a refusal to provide one.
10. Do you carry workers' compensation, and who on the crew is covered? Colorado generally requires employers with employees to carry workers' compensation, while small-company owners can sometimes be exempt, which is why you ask who is actually covered. The answer that should worry you: an uninsured crew, because an injured installer on your property can become your problem.
11. What license or registration applies in my city? Requirements vary by municipality: some cities register or license contractors, and a garage floor coating typically does not need a building permit, but confirm with your city or HOA. You can also look up a company's registration in the Colorado Secretary of State's business database. The answer that should worry you: "no license is needed anywhere" stated as a blanket fact.
| What to Check | What to Verify | Red Flag |
|---|---|---|
| General liability certificate | Policy dates, coverage limits, your name as certificate holder | Expired policy or a copy supplied by the contractor |
| Workers' compensation | Active policy and who is covered | No coverage for the people doing the work |
| Business registration | Active status and matching business name | Name on the quote does not match the registered entity |
| Municipal requirements | Any local contractor registration your city requires | Contractor cannot say what applies |
Schedule and Cure: When Can I Park on It, and What Happens If It Is Cold
Ask for two separate cure numbers, foot traffic and vehicle traffic, because a floor that is safe to walk on can still be damaged by tires. Two questions cover it.
12. When can I walk on it, and when can I drive on it? Walking is usually possible within a day. Tires need a longer chemical cure that varies by product and slab temperature: fast-cure polyaspartic topcoats reach it sooner and slower systems take several days. The number should come from the product's data sheet, written into the quote. The answer that should worry you: one number for everything, which means the question was never thought through.
13. What happens if the garage is cold? Epoxy cures by chemical reaction, and that reaction slows sharply below about 50 degrees Fahrenheit, so a coating that never fully cross-links stays soft and bonds poorly. A good answer includes monitoring the slab temperature and matching the hardener to the conditions. Our guide to polyaspartic coatings in cold weather covers how temperature windows change what an installer can do in Colorado. The answer that should worry you: "temperature doesn't matter."
| Milestone | Typical Timing | Get It in Writing |
|---|---|---|
| Light foot traffic | Hours to about a day | Product-specific time at your slab temperature |
| Vehicle traffic | About a day for fast-cure topcoats; several days for slower systems | Separate vehicle number from the data sheet |
| Full chemical cure | Up to about a week | Date after which spills and cleaners are safe |
| Install below 50 degrees F | Cure slows sharply | Slab temperature plan and hardener choice |
Warranty Questions: What Is Excluded, Who Honors It, and Is It Transferable
Ask what the warranty excludes, who honors it, and whether it transfers, because a long warranty with the wrong exclusions is shorter than it sounds. Two questions cover it.
14. What does the warranty exclude, and who honors it? Look for hot tire pickup, moisture-related failure, delamination, and UV discoloration among the exclusions, since those are the common ways garage floors actually fail. Ask whether the company, the manufacturer, or a third party stands behind it, and what happens if the company closes. The answer that should worry you: exclusions that cover the usual failures, or a warranty that is "lifetime" with no written terms.
15. Does it cover labor as well as material, and does it transfer if I sell? Some warranties replace material only and leave you paying for the labor to redo the floor. Transferability matters if you list the house. The answer that should worry you: material-only coverage, or terms that exist only as a verbal promise.
If you keep all fifteen questions in a note on your phone and ask them of every company on your list, the differences become obvious within a couple of calls. Companies that can answer specifically, in writing, with photographs and paperwork, are the ones who have done the work the same way before. A contractor who gets defensive about being asked is giving you an answer too.
Frequently Asked Questions
Ask how they will profile the concrete and how they will show you it was done. Prep is the variable that decides whether the floor lasts, and it is the one most easily skipped because it is buried under the finished coating where nobody can see it.
Colorado does not issue a statewide flooring contractor license, so licensing varies by municipality. What you can verify everywhere is general liability insurance and workers compensation coverage. Ask for a certificate of insurance sent directly from the insurer, not a copy.
A durable system is typically three stages: a penetrating primer, a build or body coat, then a protective topcoat, with flake broadcast into the body coat if you are using it. A single coat quote is a paint job and will not perform like a coating system.
Not automatically, but it changes who is accountable. Ask who holds the warranty, who supervises on site, and whether the crew doing your floor has installed that specific product before. Get the answer in writing alongside the quote.
Ask for two separate numbers: foot traffic cure and vehicle cure. Walking is usually possible within a day, but tires need full chemical cure, commonly three to seven days depending on the product and slab temperature. A contractor who gives one number has not thought it through.