Comparing Commercial Roof Coating Types
Acrylic coatings are water-based systems that reflect sunlight and can perform well on roofs where drainage is adequate. They are commonly considered for commercial roofs that need renewed surface protection and improved resistance to ultraviolet exposure. Acrylic can work over several existing roof types when the substrate is properly prepared.
Silicone coatings are designed to provide strong resistance to moisture and ultraviolet exposure. They are often a better fit for roofs where occasional ponding water is a concern. Silicone can also be applied over various existing commercial roofing systems, provided the roof is compatible and prepared correctly.
Elastomeric coatings are flexible systems that can expand and contract as the roof surface changes with temperature. This flexibility can make them useful on aging roofs with minor surface movement. The coating selected should still match the existing roof system and its condition.
Roof Coating and Existing Roof Conditions
The condition of the existing roof should guide the coating decision. A coating system is generally intended to protect and extend the service life of a roof that remains structurally sound. Significant deterioration, widespread wet insulation, or other major defects may require repairs or a different roofing solution before coating is considered.
Surface preparation also affects how well a coating performs. Dirt, loose material, damaged areas, and other conditions may need to be addressed before application. Proper preparation helps the coating bond to the roof and provides a more consistent protective layer.
Choosing a Coating for Ponding Water and Membrane Type
Standing water deserves special attention during coating selection. Acrylic coatings are generally less suitable for areas with persistent ponding water, while silicone coatings offer stronger resistance to prolonged moisture exposure. However, coating alone does not correct drainage problems, so building owners should also investigate why water remains on the roof.
Compatibility with the existing membrane is another consideration. Commercial coatings can be used over TPO, EPDM, PVC, modified bitumen, metal, and built up roofing, but the existing surface must be assessed before application. The right system depends on the membrane, surface condition, exposure, and preparation requirements.
Making the Right Roof Coating Decision
Building owners should evaluate the roof’s age, current condition, drainage, membrane type, and exposure before selecting a coating. A professional assessment can identify repairs that should be completed first and help determine whether acrylic, silicone, or elastomeric coating is appropriate.
A properly selected coating can provide another layer of weather protection without requiring a full roof replacement when the existing roof is a suitable candidate. Coatings can also be recoated at the end of the warranty period to renew coverage, subject to the condition of the roof and coating system.
For roof coating in Beavercreek, OH, contact A.H. Sturgill Roofing at (937) 254-2955 today.
FAQ
What is the difference between acrylic and silicone roof coatings for a commercial building?
Acrylic is a water-based coating that works well for reflective protection where drainage is adequate. Silicone offers stronger resistance to ponding water and prolonged moisture exposure. The existing roof and site conditions should determine which system is appropriate.
Which roof coating type works best on a flat roof that collects standing water?
Silicone is generally better suited to roofs exposed to ponding water because of its moisture resistance. However, persistent standing water can indicate a drainage issue that should be addressed as part of the roofing evaluation.
Can a roof coating be applied over any type of existing commercial roof membrane?
Coatings can be applied over several commercial roof types, including TPO, EPDM, PVC, modified bitumen, metal, and built up roofing. Compatibility and surface condition should be evaluated before application.