There are a number of terms used to describe the properties and installation process of metal roof coatings. When you are selecting a coating method, it is helpful to understand many of these terms and how they may apply to your installation.
Coating Materials
The binders used in a roof coatings help define the characteristics of the coating. Binders are combinations of polymers and resins that hold the coating together. Depending on the application, binders include rubber, vinyl, silicone, acrylics and asphalt. These form a polymer with elastic properties.
Pigments are use to provide color, opacity and resistance to ultraviolet light. The right pigments can increase the longevity of the coating through the resistance. Fillers and modifiers are added to provide strength and reinforcement. Some fillers, like ceramic particles, increase the ability of the roof coating to flow. Modifiers increase the adhesion of the coating and add resistance to weathering and oxidation.
The carriers used in a metal roof coating provide the liquidity. Carriers are solvents that evaporate as the coating dries and cures, leaving the protective film behind. The best and longest lasting coatings combine the right fillers, modifiers and binders in the correct amounts to form a strong and weather-resistant finish.
Curing
Drying and curing are two different parts of the complete metal roof coating process. Drying occurs over a series of stages, the first stage being the tack-free time. When the coating reaches this level of drying, dust and debris will not adhere to the surface. The next stage is when the coating becomes dry to the touch. Finally, the coating becomes dry enough to walk across or add a second coating layer.
Different types of coatings will all have slightly different drying times. These times can also vary by weather and humidity. Curing is the time it takes the coating to reach its peak durability and changes to a fully solid state.
Curing times for metal roof coatings vary, some take nearly 30 days for full curing. The process can involve evaporation of the solvents used in the material, a recreation to the elements or a two-part chemical change.
The characteristics and performance properties of different metal roof coatings make each type unique. Your roofing professional can work with you to select the best roof coating to meet the needs of your metal roof or metal roof repair.
