For owners of commercial buildings in McKinney, a flat roof is a major asset and a recurring expense. When that roof starts showing its age, the instinct is to budget for a full replacement. In many cases, a roof coating can extend the roof's service life for a fraction of the cost, but only when the existing roof is a good candidate. This guide explains what coatings cost, what drives the price, and how to decide whether coating or replacing makes more financial sense.
What a Roof Coating Actually Does
A coating is a fluid-applied membrane rolled or sprayed over an existing low-slope roof. Once cured, it forms a continuous, reflective surface that seals minor cracks, protects the substrate from sunlight, and reflects heat. It is a restoration, not a replacement, and it works best on a roof that is structurally sound but weathering. A coating does not fix saturated insulation or a failing deck, so a clear assessment of the current roof comes first. Applied to the right roof at the right time, a coating buys years of additional service and resets the clock on surface weathering.
Coating Types and What They Cost
Most commercial coatings fall into a few categories, each suited to different roofs and conditions. Pricing is typically quoted per square foot, installed, and varies with the system and the prep required. As general ranges for the North Texas market:
- Acrylic coatings are often the most economical, commonly in the range of two to four dollars per square foot. They reflect heat well and suit drier climates, though they perform best where ponding water is not a chronic issue.
- Silicone coatings typically run higher, often four to seven dollars per square foot, and handle ponding water and intense sun well, which makes them popular in Texas.
- Polyurethane coatings sit in a similar or higher range and offer strong impact and foot-traffic resistance for roofs that see regular maintenance access.
These figures are planning ranges, not quotes. The only accurate number comes from an inspection of your specific roof. Two buildings of identical size can land in very different places once condition and detailing are factored in.
What Drives the Final Price
Two roofs of the same size can carry very different coating costs. The main factors include:
- Existing roof condition. A clean, sound roof needs less prep. One with widespread cracking, failed seams, or wet insulation needs repairs first, and those repairs add cost.
- Roof type. The substrate, whether modified bitumen, single-ply, or metal, affects which coating systems apply and how much primer is needed.
- Number of penetrations. HVAC units, drains, vents, and skylights all require careful detailing, and a roof full of them takes more labor.
- Access and safety. Roof height, equipment, and occupancy during work all influence labor.
- Warranty length. Thicker applications that carry longer manufacturer warranties cost more upfront but extend the service life.
The Importance of a Moisture Survey
The single most important step before coating a commercial roof is confirming the insulation underneath is dry. Coating over wet insulation traps the moisture, which keeps degrading the deck while hiding the problem from view. A moisture survey, whether by infrared scan or core sampling, identifies saturated areas so they can be cut out and replaced before coating. Skipping this step is the most common reason a coating fails early, and it is worth insisting on regardless of how the roof looks from the surface.
Coating vs Replacement: The Financial Comparison
A full commercial roof replacement generally costs several times more per square foot than a coating, and it interrupts building operations. A coating, on a qualifying roof, can add years of service at a much lower cost and with less disruption. The decision usually comes down to the condition assessment:
- If the deck and insulation are dry and the membrane is simply weathering, a coating is often the smart financial move.
- If there is significant water intrusion, structural concern, or the roof is near the end of its usable life, replacement is the more responsible long-term choice.
A reflective coating can also reduce cooling load during a long North Texas summer, which adds an operating cost benefit to the capital decision. For buildings with high daytime cooling demand, that reduction can offset part of the coating cost over its service life.
What a Coating Warranty Actually Covers
Coating warranties vary widely, and the headline number rarely tells the whole story. A manufacturer material warranty covers the coating itself for a stated number of years, often tied to the thickness applied, while a contractor workmanship warranty covers the application. Some manufacturers offer a system warranty that combines both, but it usually requires a certified applicator and a documented inspection before issuance. Read what is excluded as carefully as what is included. Ponding water, foot traffic damage, and movement in the underlying roof are common exclusions, and many warranties require periodic inspections to stay valid. For a building owner, the practical takeaway is to match the warranty to how the roof will actually be used. A roof that hosts frequent HVAC service traffic needs a more durable system and a warranty that anticipates that use, while a roof that is rarely walked can prioritize reflectivity and cost. Asking these questions upfront prevents an unpleasant surprise years later when a claim is denied on a technicality.
How to Budget With Confidence
Start with a professional inspection that documents the roof's condition, moisture content, and remaining service life. Ask for a written scope that separates coating cost from any required repairs, and ask what manufacturer warranty the system carries and what it actually covers. A clear scope lets you compare options on equal terms rather than on price alone. It also helps when you need to present a capital request to ownership or a board, because the numbers are tied to documented condition rather than a guess.
At Blue Ribbon Roofing, we provide commercial roofing services to building owners across McKinney and the surrounding area, and we assess whether restoration or replacement serves the building best before recommending a path. Our 10-year labor and installation warranty reflects our commitment to getting that recommendation right.
Sources
- U.S. Department of Energy, cool roof and reflective coating guidance
- U.S. Environmental Protection Agency, ENERGY STAR roof products
- National Roofing Contractors Association, low-slope roofing and roof restoration guidelines
- Roof Coatings Manufacturers Association, coating system performance information
