CoatingsPro Magazine Supplements

ROOF 2018

CoatingsPro offers an in-depth look at coatings based on case studies, successful business operation, new products, industry news, and the safe and profitable use of coatings and equipment.

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COATINGSPRO ROOF COATINGS 2018 17 Based on these properties, silicones can be among the more expensive options. In addition, because it is diffi- cult to adhere to silicone, the existing coating may need to be removed completely upon recoating. However, in many cases, silicone can still be the best choice for a job based on the long-term savings. "Silicone is the rapidly growing piece of the market due to its ability to resist ponding water in a better fashion than acrylics," said Kemper's Arnold. A single-component white silicone option is the K ARNAK 670 Karna-Sil, described as a low-VOC, single-com- ponent, moisture-curing product that produces a durable elastic coating with strong weathering and water resistance characteristics. e company also offers the K ARNAK 501 Elasto-Brite in the elastomeric segment and the K ARNAK 502 RC-W Elasto-Kote as a thermoplastic rubber-based coating. Other suppliers in this space include Rust-Oleum, which offers a roof coating line containing silicone, white elastomeric, and aluminum coatings; National Coatings, with the AcryShield elastomeric roof coatings and the SRF silicone roof coatings lines; building envelope company e Garland Co.; GE silicone products by Momentive Performance Materials; and Tropical Roofing Products, which released a new line of Eterna-Sil low-solids and high-solids direct-bond silicones in early 2018. Within silicones, new technologies could be challenging the traditional limitations. For instance, the new formula- tion of the APOC Miracle Roof silicone roof coating offers the ability to coat existing silicone while still retaining tradi- tional properties, such as elongation, tensile strength, low temperature flexibility, and resistance to UV, chemicals, and ponding water. "Lab testing, simulations, and field testing with affili- ated APOC roofing contractors yielded exciting results with what we called an adhesive package," Gutman said. "e new formulation, dubbed Miracle Roof, maintained silicone's impressive qualities while delivering the ability to coat exist- ing silicone." Polyurethane coatings, yet another option for roofs, are either aromatic or aliphatic. Aromatics are less expensive and not UV stable, while aliphatics are UV stable, hold color well, and stay cleaner than many other coatings, according to GAF. On many jobs, a urethane coating system uses an aromatic basecoat and an aliphatic topcoat to provide a durable, clean finish that resists ponding water. However, as with silicones, they can be more expensive than acrylics. "Polyurethanes are one of the most versatile roof coatings on the market today, available in a variety of forms from one-component (1K) moisture curing or water-borne dispersions to two-component (2K) reactive systems," said Steven Reinstadtler, construction market manager for coatings, adhesives, and sealants at Covestro. "ey are frequently selected due to a unique combination of durability, flexibility, and weatherability," Reinstadtler said. "ese coatings also provide reduced VOC emissions, superior coating thickness, and edge retention. A well-formulated polyurethane roof coating can be applied thicker in one coat to increase productivity and reduce application time." According to Reinstadtler, a typical 2K polyurethane roof coating is a 100 percent solids system processed through a plural component spray machine due to its faster curing speed. is quicker cure time is often preferred by roofing contrac- tors since it provides a faster return-to-service than when using traditional roller or squeegee application techniques. "Recently, the fastest-growing class of polyure- thane-based roof coatings is 2K aliphatic," Reinstadtler said. "is technology incorporates an aliphatic hardener similar to those used in automotive clear coat finishes, resulting in a UV- and weather-stable, water-resistant coating. ese 2K coatings have increased crosslink density in the final polymer, enhancing important physical properties such as hail impact resistance and abrasion from normal maintenance." Reinstadtler presented an educational webinar for CoatingsPro on the different types of polyurethane coatings. Roofing Projects continued on page 22 KARNAK's 670 Karna-Sil is one coating example with specific situational benefits. This silicone offers low volatile organic compounds along with strong weathering and water resistance characteristics, according to the company. Some coating manufacturers are going even further with their offerings by using new technologies to aid the contractor. GAF, for example, has a virtual reality experience that may help showcase the technologies. Roofing Projects

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