CoatingsPro Magazine

JUL 2013

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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existing lead-based coating. These hand-held 40,000 psi (276 MPa) hydro-blasting systems are self-contained, meaning that the water used for the blasting goes straight back into a collection tank. According to Hendrick, the water from the two hand-held units was then placed into a 20,000-gallon (75,708 L) tank where it was tested by Galaxy Environmental. The positive results of the tests determined that the crew had to follow the required disposal methods and procedures for the water and paint debris. Another factor that had to be considered during the lead mitigation was the air quality inside the buildings. There were children housed inside the facility while the work on the exterior of the buildings was in progress, and their safety was the first priority. "At all times during the lead mitigation, air monitoring needed to be conducted inside the building. Madison Coatings worked with GSG Environmental to ensure that the air quality was safe inside Cook County Temporary Juvenile Detention Center," said Hendrick. CoMPletinG A 5k…twiCe With the lead mitigation complete, the Madison Coatings team was ready to start the next phase: a second power washing of the exterior of the buildings. The crew used 6,000 psi (41 MPa) power washers to remove any remaining oil, grease, and/or contaminants and to ensure that the steel was ready for the application of the coatings system. However, another step remained in the process before the crew could get down to the business of applying the Tnemec coatings system — the caulking around the exterior joints of all three structures had to be removed and new sealant had to be applied. The crew had kept the existing caulking intact during the first and second round of power washing to keep the building watertight, but it needed to come up before the new coating system was applied. "There were nearly three miles (5 kilometers) of caulking that we removed and then went back and reapplied," stated Hendrick. helPful CoAtinGs With all aspects of the surface preparation complete, it was time for the crew to install the Tnemec coating system. Over the bare steel, the crew applied Series 135 Chembuild primer at a dry film thickness of 3 to 6 mils (76‒152 microns). This modified polyamidoamine epoxy high-build coating exhibits abrasion-, chemical-, and corrosion-resistance, making it a good primer choice for the Above The crew primed the building with Tnemec's Series 135 Chembuild using brushes and rollers. Then they added Series 215 Surfacing Epoxy on pitted areas. steel exterior panels. Once the primer was brush- and roller-applied, the crew used Series 215 Surfacing Epoxy on any pitted areas of the steel. Series 135 is an advanced generation, 100 percent solids epoxy filler and surfacer for use on concrete or steel. "Once the pitted areas were patched, we were ready to apply 2 to 6 mils [51‒152 microns] of the Series 27 F.C. Typoxy to all areas of the exterior," said Hendrick. Series 27 is a polyamide epoxy coating that provides fast curing and rapid handling capabilities. According to Hendrick, it acts as the intermediate coat for the system and provides the tie-in for the 1071V Fluoronar topcoat. "Series 1071V is a low volatile organic compound (VOC) fluoropolymer coating that provides a durable finish and has outstanding color and gloss retention even in the most severe exposures, such as winter in Chicago," stated Chris Wascher of Tnemec. Hendrick and his crew brush- and rollerapplied the Series 1071V topcoat at a dry film thickness of 2 to 3 mils (51‒76 microns). As stated by Hendrick, there was one additional but very important step in the process of recoating the exterior of the buildings. "We applied CAFCO Blaze-Shield to the exposed soffits after demolition of existing panels prior to installing the new soffit ceiling panels," said Hendrick. Isolatek's Blaze-Shield is designed to provide fire protection for structural steel in commercial construction environments, especially those where there is exposure to severe weather conditions. As previously mentioned, the choice of the Tnemec coatings system for the exterior of the Cook County Temporary Juvenile Detention Center helped earn Cook County credits toward the LEED certification of the buildings. While coatings can certainly play a role in LEED certification, it is important to note that the process is much more than that. According to the LEED website, http://www.usgbc.org/leed, the program provides third-party verification of green buildings. LEED-certified buildings are designed to have lower operating costs and to increase asset value, reduce Left "Once the pitted areas were patched, we were ready to apply 2–6 mils [51–152 microns] of the Series 27 F.C. Typoxy to all areas of the exterior," said Madison Coatings' Daniel Hendrick. 60 CoatingsPro g July 2013

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