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COATINGSPRO ROOF COATINGS 2017 13 line of equipment and acces- sories for the spray appli- cation of SPF and coatings. e company's Barrel Blazer drum heater, described by Digital Marketing Director Jennifer Davidson as a "customer favorite," allows roofing contractors to keep a watchful eye on the exact temperature of the material. "Offering a high or low setting for those freezing or chilly nights, the Barrel Blazer allows you to set it and forget it with up to 55 gal. [208.2 L] of coatings material on each heater," Davidson explained. "ere's an optional barrel rack, which easily secures one or multiple Barrel Blazers inside a spray rig. An optional digital monitor tracks the exact temperature of your material from the bottom of the drum where the material is first released." Hennes-Johnson Equipment Co., which also offers an equipment line for roofing contractors, has several handy application guides available on its website, includ- ing "Equipment Recommendations for Modified Bitumen Cold Adhesive Spray Application" and "Understanding and Selecting Cold Process Application Equipment." On some jobs, overspray concerns due to wind or the presence of cars or people immediately beneath the jobsite may make spraying untenable. But at the same time, using smaller brushes, rollers, or squeegees could be uneconomical due to excessive time commitments. For this conundrum, Rooftop Equipment developed its SuperSpreader, which uses 40-inch (101.6 cm) disposable rollers to apply more than 300 square feet (27.9 m 2 ) of material per minute. "You're putting down a path," Rooftop's Burns said. "It's like mowing your lawn. You can go pretty well with the 40-inch roller, especially in a wide open area." Even so, Burns recommends that each crew have someone doing "touch up" after using the larger spreading tool with a 9-inch (22.9 cm) roller to ensure that there are no thin spots in the coating or puddles. Manufacturers of smaller application equipment include e Brushman, Magnolia Brush, Seymour Midwest, and e Wooster Brush Company. Roof Coating Systems continued on page 16 to not disturb the integrity of the underlying roof membrane, particularly where there are adhered seams, RCMA noted. Dust, chalking film, bitumen exudate, greases or oils, and other loose debris should all be cleaned off in this process. On some occasions, primers may be required, depending on the substrate and type of coating. Surfaces that generally require primer include metal flashings, gravel stops, metal edging, concrete roof decks, masonry walls and flooring, gypsum, and other porous surfaces. Rusted metal roofs can be coated after the rust conditions have been addressed. Application Tips With repairs and preparation complete, contractors can finally progress to application! Roof coatings are usually applied by brushing, rolling, squeegeeing, or spraying — and often times in combination. On many projects, coatings on the larger areas of the roof can be spray applied, while smaller nooks and crannies may require the personal touch of a brush or roller. "e number one factor is the size of the roof," said Kemper System's Arnold. "at's going to dictate your appli- cation type, whether it be hand-applied with rollers or done with spray rigs. A lot of times, spray rigs get taken out of the mix if you might have issues with potential overspray on adjacent parts of the building or cars or people below. Everybody is sensitive to that. Spray rigs can really get a lot of product down quickly, whereas hand-applied is going to take some time. It' ll be a lot more labor intensive. Most all products in the coating world are sprayable, but it's what's going to happen if you spray that has to be considered." On the spraying side, plural component (2K) material is applied using plural component equipment that heats and mixes the products internally before they are applied to the surface. Polyurethane Machinery Corp. (PMC) is one company that specializes in this. e company's PH-55 machine, which delivers 55 lb./min. (24.9 kg/min.) of output, represents an upgrade for previous 40-lb./min. (18.1 kg/min.) models. "is was developed in response to roofers not having enough volume out of the previous system," said Murphy Mahaffey, PMC's director of international sales. "Roofers who really know what they're doing and who are very skilled can manage more material than that." "Essentially, what we did was increase the horse- power and the throughput," Mahaffey explained. "It's still a horizontal pumping system with the same technology — just the capacity is better. We're getting roofers on and off the job faster, and time is money." e PH-55 machine can be combined with PMC's PX-7 mechanical purge gun, which incorporates a valving rod to mechanically purge the mixed material from the mixing module at the end of each shot. is eliminates the need for solvent flushing or air purge. SprayWorks Equipment is another specialist with a full Roof Coating Systems Next, how the coating will be applied (e. g . , b r u s h es , ro l le rs , s q u eegees , and sprayers) must be determined. Plural component (2K) coatings, for example, need to be applied with 2K machines, such as from Polyurethane Machinery Corp.

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