A client came to us recently after getting a quote from another contractor. The contractor had told them they would need a moisture vapor barrier installed before any floor coating could go down — adding cost to an already significant investment. The client wasn’t sure whether to believe it. They did the right thing and called us.
In most Colorado Springs area homes, that recommendation is not supported by the climate, the soil conditions, or the science. Here is what you actually need to know before you make a decision.
What Is a Moisture Vapor Barrier?
A moisture vapor barrier (sometimes called a moisture vapor retarder or MVB) is a layer installed between a concrete slab and a floor coating to block water vapor that migrates up through the concrete from the ground beneath it. Vapor migration is a real phenomenon. In the right conditions — high water tables, saturated clay soils, humid climates, below-grade slabs — it can push enough moisture through a slab to compromise a coating’s bond and cause bubbling, delamination, or premature failure.
The keyword in that sentence is conditions. A moisture vapor barrier is a solution to a specific problem. It is not a blanket requirement. Whether you actually need one depends entirely on your climate, your soil, and your slab — not on a contractor’s default recommendation.
Colorado Springs Is One of the Driest Major Cities in the Country
Colorado Springs sits at 6,035 feet above sea level. The city receives an average of only 17-19 inches of precipitation per year — less than half the U.S. national average of 38 inches. Annual average relative humidity hovers around 42 to 57 percent, compared to a national average closer to 60 to 70 percent. With more than 300 days of sunshine per year and consistently low ambient humidity, the atmospheric conditions that drive moisture vapor upward through concrete are simply not common here. (Climate normals for Colorado Springs — National Weather Service)
At high altitude, lower atmospheric pressure actually accelerates evaporation. Concrete in Colorado dries more efficiently than concrete in coastal or humid climates. That is not an opinion — it is basic physics applied to local conditions.
For a slab-on-grade residential garage in the Colorado Springs area, the moisture vapor emission rate (MVER) is typically well below the industry threshold of 3 pounds per 1,000 square feet per 24 hours established by ASTM F1869. Independent testing and 16 years of installation experience back that up. We have applied hundreds of polyaspartic floor coatings across this region. Moisture vapor failure — the kind that warrants a vapor barrier — is rare in standard above-grade residential garages here.
Below-grade spaces like basements are a different conversation, and we assess those individually.
What Actually Drives Moisture Issues in Concrete
When moisture does cause a floor coating to fail, it almost always comes down to one of three things:
1. New concrete that hasn’t cured long enough. Fresh concrete contains a significant amount of water — it has to, because water is part of the chemical reaction that makes concrete harden. That process, called hydration, takes time. Industry standards and manufacturer specifications are clear: concrete must cure for a minimum of 28 days before a coating is applied.
At the 28-day mark, the slab has released enough moisture and the hydration process has progressed far enough that a floor coating can bond properly. Apply a coating before that window closes and you are sealing moisture inside the slab. The result is bubbling, peeling, and bond failure — not because the product failed, but because the installation timeline was wrong.
If you have recently had a garage slab poured or replaced, the 28-day wait is non-negotiable. We will always ask. If a contractor doesn’t ask, that is a red flag.
2. Alkalinity and outgassing from fresh concrete. Fresh concrete is highly alkaline, and during the hydration process it releases gases as part of the chemical reaction. If a coating is applied prematurely, those gases have nowhere to go — they get trapped beneath the sealed surface and cause blistering. This is called outgassing, and it is completely preventable by respecting the curing window.
After 28 days, the alkalinity stabilizes and outgassing slows to a level that a properly prepared surface can accommodate. Surface preparation — specifically diamond grinding — also plays a critical role here. Opening the pores of the concrete during grinding gives the coating the mechanical anchor it needs and allows any remaining gases a path to release before the coating locks everything down. Proper concrete grinding →
3. A coating that isn’t built to handle moisture. Epoxy is significantly more sensitive to moisture than polyaspartic. It requires stricter humidity conditions during application — typically above 50°F with relative humidity below a specific threshold — and is more vulnerable to vapor migration over time. This sensitivity is one of the reasons contractors who work with epoxy may be more inclined to recommend moisture mitigation measures as a precaution.
Polyaspartic coatings have a higher tolerance for moisture and a stronger chemical bond to properly prepared concrete — a bond strength validated by independent ASTM D4541 adhesion pull-off strength testing. This is one of the meaningful performance differences between the two systems. See how polyaspartic compares to epoxy →
We Test If You Are Unsure — So You Don’t Have to Wonder
We understand that some customers want confirmation, not just reassurance. That is completely reasonable. When a client has concerns about moisture — whether because of a previous floor failure, a basement installation, or a contractor’s recommendation they weren’t sure about — we can perform moisture testing on the slab before any coating goes down.
We use the Tramex Concrete Moisture Encounter CME5 — a professional-grade meter that uses radio frequency technology to measure moisture content through the slab without drilling or damaging the concrete. Before any installation where moisture might be an issue, we test to confirm moisture content is at or below 4.5 percent. You get a real number, not a guess — and if the slab doesn’t pass, we tell you before anything goes down. Just ask — we can test before anything goes down.
The test gives you a number. That number either confirms the slab is within safe range or it doesn’t. If it doesn’t, we tell you — and we discuss your options honestly. We have no interest in installing a floor that is going to fail, and we have no interest in selling you a moisture barrier you don’t need.
In 16 years of installing polyaspartic floor coatings across the Colorado Springs area, we have rarely encountered a residential above-grade garage slab that required additional moisture mitigation. That track record is a function of the climate we work in — and of the preparation process we follow on every job.
What the Competitor Recommendation Might Have Been About
When another contractor tells you that you need a moisture vapor barrier, there are a few possible explanations.
It may be a legitimate precaution based on specific conditions they observed. There are situations where testing results or site conditions genuinely warrant it, and a contractor who takes that seriously is doing the right thing.
It may also be a precaution built around the limitations of their product. Coatings that are more moisture-sensitive require tighter installation conditions and may carry a higher risk of bond failure without additional preparation. A moisture vapor barrier becomes a form of insurance when the coating itself has less tolerance for vapor.
Or it may be an upsell — an added cost that isn’t supported by the actual conditions of your garage.
The way to know which it is: ask for test results. If a contractor recommends a moisture vapor barrier, ask to see the data that justifies the recommendation. A specific ASTM F1869 (calcium chloride) or ASTM F2170 (in-slab relative humidity probe) result is a defensible answer. “Better safe than sorry” is not.
The Bottom Line
Moisture vapor is a real concern for floor coatings in climates where it is actually a factor. Colorado Springs is not that climate for the vast majority of residential garage applications. The altitude, the low humidity, and the dry soil conditions work in your favor.
What does matter here — and what we never shortcut — is proper curing time on new concrete, proper surface preparation, and the right coating system for the environment. Polyaspartic meets all three of those requirements. It is built for performance in Colorado conditions: UV-stable, freeze-thaw resistant, diamond-ground for maximum adhesion, and backed by a residential lifetime warranty. See how our 3-coat polyaspartic system works →
If you have questions about moisture, your slab, or whether your garage is ready for a coating, we will give you a straight answer — and we can test if you want the data to confirm it. Request your free estimate →