Butyl Roof Coatings
At American WeatherStar, we offer a variety of different fluid-applied roof coating systems to protect and restore both flat and metal roof surfaces. Once applied, these systems not only stop and prevent roof leaks, they reduce HVAC system workloads, improve the look of your building, and most importantly, save you money!
Butyl roof coatings are just one of the many chemistry types that we incorporate into our fluid-applied roofing systems. With that in mind, let’s examine the benefits and limitations of butyl roof coatings and what factors you should consider before installing a butyl roof coating system on your building.
What Are the Benefits of Butyl Roof Coatings?
Butyl roof coatings are an excellent restoration solution for nearly all commercial roofing substrates. This solvent-based, elastomeric polymer is very common in the industry and can be used for a variety of different applications. That being said, what benefits do butyl roof coatings offer, and what does that mean to building owners and managers?
Superior Elongation and Tensile Strength
Butyl roof coatings are probably best known for their excellent elongation and high tensile strength. Once cured, this solvent-based, polymer coating forms a flexible, durable, and seamless membrane that can withstand daily expansion and contraction (thermal cycling) of the roof structure.
Excellent Vapor Retardant Barrier
Butyl roof coatings also serve as an excellent vapor retardant coating, making it ideal for use over spray polyurethane foam in cold storage or freezer applications.
Because butyl roof coatings can reflect 80-90% of the sun’s harmful UV rays, building owners and managers can save thousands of dollars by drastically reducing cooling costs during the summer months. Minimizing the sun’s impact on the roofing surface not only helps to sustain lower energy costs as the system ages, it reduces internal building temperatures and helps extend roof life.
What Are the Limitations of Butyl Roof Coatings?
Low Solids Content
Butyl coatings have a low solids content, which means that once the coating has completely dried, only a small percentage of solid material remains on the roof surface. In this regard, butyl roof coatings are not as cost-effective as other roof coatings products because more of it has to be applied to achieve the desired dry film thickness (DFT).
Can Be Challenging to Spray
As with any solvent-based coating, butyl roof coatings can be difficult on hydraulic spray equipment. Issues during the installation process are less likely to occur if the spray equipment is properly cleaned and maintained.
Suitable Surfaces:MetalModified BitumenBuilt-UpSingle-PlySpray Polyurethane Foam