Do roof coatings work on commercial buildings? Building owners may be rightfully hesitant to make the investment if they aren’t sure how effective these systems actually are. We’re here to explain the primary types of commercial roof coatings, how they protect your facility, and whether they will save you money in the long run.
Will a Roof Coating Work on Your Roof?
Before investing in a fluid-applied roofing system, it’s essential to determine if your building’s existing roof is a good candidate. Generally, your roof should have a minimum slope of 1/4 inch per foot, edge-mounted gutters or functioning interior drains (rather than relying solely on scuppers), and no chronic standing or ponding water. There are a few primary types of commercial roof coatings available, each suited to different roof assemblies and climate conditions.
Waterproof vs. Reflective Coatings
When dealing with low-slope or flat commercial roofs, high-performance waterproof coatings can significantly extend the lifespan of your existing roof membrane. It’s important to note that many off-the-shelf coatings sold in retail stores are only reflective and offer little to no true waterproofing capability. Always review technical data sheets (TDS) prior to selection. A professional-grade coating that provides both waterproofing and high solar reflectivity saves significant money on energy bills and leak maintenance over time.
Reflective Elastomeric Coatings
Reflective solar-reflective coatings extend roof life and lower utility costs by significantly reducing thermal heat transfer into your building. Applying a bright white or aluminum-reflective coating via spray, roller, or brush helps maintain lower interior temperatures during hot Gulf Coast summers. Professional painting contractors can evaluate your insulation, roof substrate, and local weather patterns to deliver a seamless system that is both reflective and watertight.
Silicone Roof Coatings
Solvent-based silicone roof coatings feature low VOC levels, excellent weather resistance, and high resistance to ponding water. They perform well in high-humidity environments, are moisture-curing, UV-resistant, and won’t chalk or degrade under intense sun exposure. Silicone coatings create a seamless, cool roof membrane that typically lasts 10 to 15 years before requiring a simple maintenance topcoat. However, because silicone membranes are non-breathable, any moisture trapped within the existing roof substrate prior to application cannot escape, which can lead to blistering if wet insulation isn’t repaired beforehand.
Acrylic Elastomeric Roof Coatings
Acrylic elastomeric roof coatings are dense, highly flexible water-based systems designed to expand and contract with fluctuating temperatures. They handle moderate foot traffic and provide outstanding tensile strength against high winds, hail, and extreme storm debris common across the Gulf Coast. Acrylic coatings require positive slope drainage, as prolonged ponding water can cause water-based acrylics to soften over time. When applied over a sound, dry substrate, an acrylic coating system delivers long-lasting protection and superior cost-per-year value.
Coating Metal Roof Systems
Can a rusted metal roof be coated? Yes, provided the surface oxidation is addressed first. For “red rust” (corroded steel), loose rust must be wire-brushed or power-washed away, followed by an application of a rust-inhibiting primer and replacement of backed-out or corroded fasteners. For “white rust” (corrosion on zinc or galvanized steel), the roof simply needs a deep pressure wash and thorough degreasing before applying the primer and finish coat.
Roof Coating Upkeep & Maintenance
To preserve your coating system and maintain manufacturer warranty coverage, inspect your commercial roof twice a year (typically in spring and fall) and immediately following major weather events or high-wind storms. Touch up any physical punctures or mechanical damage using compatible patch sealants to keep the seamless barrier intact.
In summary, the ideal candidate for a commercial roof coating system is a low-slope roof in good structural condition with dry substrate insulation and proper drainage. If your building meets these criteria, a coating system is a cost-effective alternative to a full tear-off and roof replacement. At Pro Painters, we specialize in commercial roof coatings, surface prep, and full-service Houston commercial painting. Learn more about our specialized roof coating and roof cleaning systems, or contact us today for a free commercial quote!
