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COATINGSPRO NOVEMBER 2017 35 times, so we wanted a safety monitor on the ground for precau- tions and also on the roof. We coordinated with the college's maintenance crew, too, to let them know where we were so that they could also let students know." Applying Strategies e crew began on the fitness center with 3,500-psi (24.1 MPa) pressure washers from DeWalt and applying GAF's CleanAct primer. "It's a soapy primer mixed with water when pressure washing," Carmona explained. "Two or three guys were using the pressure washers, while others were scrubbing the primer on with a roof brush, and then we let it sit for 24 hours." e primer was applied at a rate of 0.2 gallon per 100 square feet (0.76 L/9.3 m 2 ). For small areas of the roof that were saturated and needed to be removed, the crew used a Cleasby single-blade roof saw. If moisture was on the substrate due to rain or other issues, they dried it with Makita MM4 4-stroke backpack roof blowers. en, the HydroStop PremiumCoat system, including two Foundation Coat layers, each applied at 1.25 gallons per 100 square feet (4.7 L/9.3 m 2 ), an embedded PremiumCoat Fabric layer, and finally two Finish Coat layers, each applied at 1 gallon per 100 square feet (3.8 L/9.3 m 2 ), was put down. Overall, the system's total dry film thickness (DFT) was to be an average of 44 mils (1,118 microns), with 27 mils (685.8 microns) combined for the Foundation Coat layers and 17 mils (431.8 microns) combined for the Finish Coat layers. e crew used 10-inch (25.4 cm) stiff-bristled roofing brushes to apply the Foundation Coat system. "We're brush- ing the system into the membrane," Carmona explained. "We advance 4 feet [1.2 m], then immediately go back, cover, and then advance another 4 feet [1.2 m]. I like to keep three guys in line, and each has his own roll of polyester and the Foundation Coat. We come back with the polyester when wet, and then add another layer of the Foundation Coat via brush." Remaining crew members were used to bring more material to the roof as needed. JOB AT A GLANCE PROJECT: Renovate college building roofs with an elastomeric roofing system COATINGS CONTRACTOR: RoofCARE 14810 Central Ave. SE, Ste. 100 Albuquerque, NM 87123 (888) 336-3037 www.roofcare.us SIZE OF CONTRACTOR: ~48 employees SIZE OF CREW: 3-6 crew members, depending on project stage PRIME CLIENT: Santa Fe Community College 6401 Richards Ave. Santa Fe, NM 87508 (505) 428-1000 www.sfcc.edu SUBSTRATE: EPDM (ethylene propylene diene terpolymer) and BUR (built-up roof) cap sheet roofs CONDITION OF SUBSTRATE: Fair to poor SIZE OF JOB: 192,664 sq. ft. (17,899 m²) total DURATION: ~6 months UNUSUAL FACTORS/CHALLENGES: » The HydroStop system could only be applied when temperatures were at 50 °F (10 °C) and rising for at least 48 hours. » A crew was sent out to remove rainwater with industrial blowers. » To protect against overspray, work was only conducted when winds were calm or minimal. MATERIALS/PROCESSES: » Pressure washed and applied GAF's UniBase primer via rollers on BUR » Power scrubbed with GAF's CleanAct primer, then finished with a power wash for EPDM » Used a single-blade roof saw to remove small saturated areas » Sealed all walls, curbs, and penetrations with GAF's HydroStop PremiumCoat Fabric and Foundation Coat » Installed HydroStop PremiumCoat Fabric and Foundation Coat over roof at ~27 mils (685.8 microns) dry film thickness (DFT) » Sprayed, rolled, and brushed on two layers of HydroStop Finish Coat over entire roof system at ~17 mils (431.8 microns) DFT » Installed new vents and re-installed counterflashing SAFETY CONSIDERATIONS: » Wore safety glasses, safety vests, hard hats, gloves, boots, and respira- tors when spraying » Utilized fall protection and safety flags when necessary » Utilized a ground safety monitor when working outside safety line » Sent someone inside when re-decking abandoned curbs, in case tools or material were dropped B efo re co ating , th e crew p re s sure wa sh e d th e BUR an d p r im e d. On the EPDM, they power scrubbed with a primer and then power washed. They wore proper safet y gear and fall protection and used monitors throughout.