CoatingsPro Magazine

JUL 2017

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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Page 51 of 68

COATINGSPRO JULY 2017 51 replaced loose flashings and secured any loose felts. "Most of the areas that required repair were around the perimeter of the parapet walls. However, the good thing about the SPF system is that it is monolithic, and we were able to make repairs and then spray up to the wall and taper the material up the surface," said Palmer, who described the damaged areas as simply needing some TLC. With all repairs made, it was time for the Spray-Tec team to begin spraying the Gaco Roof Foam, a closed-cell monolithic polyurethane that bonds to the substrate and becomes part of the structure. e team used a Graco H40 proportioner to install 1½ inches (3.8 cm) of SPF to encapsulate the roof. As stated by Palmer, one pass was made during the application of the coating to the roof sections. However, on the parapet walls, two passes were required: one to encapsulate and seal the surface and the other to create an aesthetically pleasing appearance. Work in the section was not complete… yet. "e SPF is the insulating factor in the roof system, but it needs UV [ultraviolet] protection and waterproofing. is is why the silicone coating is such an important piece of the puzzle," explained Palmer. As such, the crew used a Hennes-Johnson 56:1 coating pump to apply Gaco Western S2000 series high solids silicone coating. First, a basecoat of 18‒20 wet mils (457.2‒508.0 microns) was installed. en 16‒18 wet mils (406.4‒457.2 microns) of the same coating were applied, and 3M ceramic granules were embed- ded in the wet coating. Once this step was finished, it was time to move on to the next section of the roof. For all sections, the crew used MSA Advantage 2000 respirators, Protective Industrial Products (PIP) gloves, spray socks, and safety glasses. Spray-Tec got their equipment from Bailey Tools and Safety. Breezy Conditions and Crowded Spaces Over the course of the 10 days that the Spray-Tec crew members were on the job, they encountered numerous challenges, includ- ing some windy conditions that halted spraying for a time. "W hen we're working on a roof, wind is always our biggest obstacle. We can work around rain, know that we can't spray when it's really windy, but when it's simply breezy out, we have Wearing respirators, gloves, spray sock s, and safet y glasses — not to mention being tied off 100 percent of the time — the crew applied two coats of Gaco Western S2000 silicone with 3M granules. JOB AT A GLANCE PROJECT: Install spray polyurethane foam (SPF) and silicone coatings to the roof of a historic building in the Portland neighborhood of Louisville, Kentucky COATINGS CONTRACTOR: Spray-Tec 1132 Equity St. Shelbyville, KY (502) 633-5499 SIZE OF CONTRACTOR: 25-30 employees SIZE OF CREW: 5 crew members PRIME CLIENT: Facilities Management Services 4400 Bishop Lane, Ste. 108 Louisville, KY 40218 (502) 479-3286 SUBSTRATE: Built-up roof (BUR) over wood decking CONDITION OF SUBSTRATE: Aging roof with some areas of damage SIZE OF JOB: 20,500 sq. ft. (1,904.5 m²) DURATION: 10 days UNUSUAL FACTORS/CHALLENGES: » Breezy conditions required the use of windscreens. » High winds halted spraying of SPF and silicone coating for a time during the job. » Many other trades were onsite working on other renovation projects. MATERIALS/PROCESSES: » Power washed and cleaned sections of the roof area » Removed loose flashings and secured any loose felt » Applied Gaco Western spray foam at a thickness of 1½ inches (3.8 cm) using a Graco H40 proportioner; one pass on roof and two passes on the parapet walls » Applied two coats of Gaco Western S2000 series high-solids silicone coating using a Hennes-Johnson 56:1 coating pump; the first coat was applied at a thickness of 18-20 wet mils (457.2-508.0 microns), and the second coat was applied at a thickness of 16-18 wet mils (406.4-457.2 microns); embedded 3M ceramic granules in the coating SAFETY CONSIDERATIONS: » Used warning lines around all open edges » Tied off 100 percent when outside of the 6-foot (1.8 m) perimeter area, wore harnesses, retractables, lanyards, lifelines, and anchors when working in these areas » Wore respirators, gloves, spray socks, and safety glasses » Held daily safety meetings

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