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COATINGSPRO ROOF COATINGS 2017 9 surfaces, just layers upon layers of different substrates." Different roof coatings have better performance on different roofing substrates, Gibbons explained, adding that in some circumstances, a special roofing primer may be the best practice to gain adhesion or prevent bleed through. Other possible substrates to receive coating and/or SPF systems may include modified bitumen, metal panel, concrete, thermoplastic polyolefin (TPO), fiberglass, ethylene propylene diene terpolymer membrane (EPDM), and hypalon. Many coatings manufacturers offer choices engineered for specific substrates, including K ARNAK, which has specialty base coats designed for metal, concrete, asphalt, EPDM, new SPF, aged single-ply membranes, and previously coated roofs. Importance of Inspections To prepare a substrate for a new coating, installation inspec- tions are also a crucial job component. ese inspections can ensure the contractor is aware of all defects and problems with the roof beforehand, thus allowing them to be corrected before application begins. One common defect found on roofing jobs is moisture damage, and contractors should be prepared to remove and replace all water-damaged areas prior to applying roof coatings and/or SPF systems. Companies such as Infra-red Analyzers, RoofscanIR, Diamond Technology Surveys (DTS), and Stockton Infrared ermographic Services offer various types of infrared moisture testing services that contractors can use to identify areas needing repair. "Despite widely recognized problems associated with coating wet substrates, many projects are still being completed without the critical information provided by high-quality roof moisture surveys," said Peter Brooks, presi- dent of Infra-red Analyzers. "Infrared testing pinpoints and documents areas of wet insulation and eliminates guesswork about moisture damage." At this stage, either the contractor or facility owner should also consult with the terms and conditions of the existing roof 's warranty, according to the Roof Coatings Manufacturers Association (RCMA). In many cases, the roofing manufacturer may require a specific type of pre- or post-inspection, as well as steps to prepare the roof for appli- cation. Otherwise, the warranty could be voided. Even after the new system is applied, RCMA still recommends that every roof be inspected twice each year, in the spring and fall, and after major storms or high wind events. Additional layers of coatings may need to be applied to repair damage to the protective system or the underlying substrate, and this appli- cation can boost the roof 's long-term service life. New technologies are also playing an increasing role in this space. For example, the FLIR Aerial Inspection Kit utilizes a drone with a FLIR-built thermal camera. "ermal-equipped drones offer a really great way to gain a new perspective of your roof," said FLIR's Tim McDowd. For roofers interested in cameras without the drone, the FLIR T500-Series and FLIR Exx-Series offer more cost-effi- cient options. Preparation and Repair With the substrate's condition identified from the inspec- tion, the next step involves repair. "W hile roof coatings will always be marketable and have very long warranties in regard to timelines, that really doesn't apply if you aren't doing the right patch and repair work," explained Rust-Oleum's Gibbons. "If you're working on a roof with leaks and you throw down a new coating on top of it, you're not going to get Roof Coating Systems continued on page 12 Roof Coating Systems Roofing also adds the variable of substrate types. Common substrates include single-ply membranes, metal, modified bitumen, concrete, and built-up roofs (BURs). Coating manufacturers, such as KARNAK, create base coats for specific substrates. Before a solution can be chosen, the roof needs to be inspected for defects and problems, such as moisture damage. Infrared moisture testing tools, such as those from FLIR Systems, can help to identify problems.

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