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COATINGSPRO JANUARY 2017 53 and the commercial-grade California-compliant Bay A rea A ir Quality Management District high solids silicone, Har vey said the decision was made to take on the job. A Seamless System e team had a tight deadline. e job had to be done in three calendar weeks, meaning they had a total of 15 work days to complete the job. But Harvey's crew was up to the challenge. e existing roof — measuring in at 15,000 square feet (1,393.5 m²) — was in very poor condition, so the first step was to correct all defects and water intrusion points before power washing, Harvey said. "During this up close and tactile examination of the roof system, areas of possible substrate deterioration were discov- ered," said Harvey. "e existing membrane was removed to facilitate minor roof substrate wood deck repairs. e existing membrane roofing was then restored to a waterproof state prior to the power washing phase. Wedge Roofing next augmented the existing single-ply fastener pattern with additional screws and plates installed so as to attain the highest possible Underwriters Par ticularly when applying SPF, also called spray foam, the crew needed to wear personal protective equipment (PPE). That included chemical-resistant Ty vek suits, gloves, and full-face masks with 3M's 7500 series respirators and 5201 filters. Installing the system under assets was tricky. The crew found a way to apply the spray foam to boards, slide them under the assets, and then integrate them into the surrounding parts of the system. JOB AT A GLANCE PROJECT: Install a new roof system with spray polyurethane foam (SPF) and coatings at a manufacturing facility COATINGS CONTRACTOR: Wedge Roofing 5 Casa Grande Rd. Petaluma, CA 94954 (707) 763-5475 www.wedgeroofing.com SIZE OF CONTRACTOR: 45 employees SIZE OF CREW: 8–10 crew members PRIME CLIENT: Small Precision Tools 1330 Clegg St. Petaluma, CA 94954 (707) 762-5880 www.smallprecisiontools.com SUBSTRATE: Existing membrane CONDITION OF SUBSTRATE: New SIZE OF JOB: 15,000 sq. ft. (1,393.5 m²) DURATION: 14 days UNUSUAL FACTORS/CHALLENGES: » Roof components had to remain operational during the job. » The job had a short timeline. » The facility was a lab clean environment. MATERIALS/PROCESSES: » Removed existing membrane down to the wood deck and power washed » Applied PREMICOTE P-64, Plasticizer Migration Resistant Primer, applied at 0.5 gal. per 100 sq. ft. (1.9 L per 9.3 m²) » Installed 1.5 in. (3.81 cm) of Premium Spray Products' PREMISEAL 280 SPF using Graco E-30 reactor based spray rigs, Fusion AP guns, and D guns » Applied Premium Spray Products' PREMICOTE 2100 high solids silicone using a Graco XTR-7 and 933 pumps at a thickness of approximately 15.4 dry mils (391.2 microns) » Applied an additional 0.5 gallons (1.9 L) of silicone coating to receive Lucas Products' #10 fire white granules SAFETY CONSIDERATIONS: » Wore chemical-resistant Tyvek suits, gloves, and full-face masks consisting of 3M's 7500 series respirators with 5201 filters when applying SPF and coatings » Worked with care around potentially hazardous areas, such as high temperature furnace exhaust vents » Controlled access to the work area