CoatingsPro Magazine

JUL 2018

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 27 of 68

e roof looked like a heavily cratered part of the moon," said Harvey. e botched SPF application left the boutique vintner without a usable chilled storage facility. With the harvest season only three short weeks away, the nine-person Wedge Roofing team knew they'd be racing against time to remedy the situation and get the storage facility up and running. Decision Time After the Wedge Roofing crew assessed the situation, there seemed to be only two options: scrape, grind, and remove thousands of board feet of SPF and start from scratch, or take core samples to determine whether a new SPF product could be applied over the existing intumescent coating. "With the building's irregular framing characteristics and a few other impediments to the demolition work, tearing off all of the old SPF could have potentially added three to four days of tedious removal and prep before we could even begin the application of new SPF. is was precious time we just didn't have if we wanted to beat the harvest deadline," said Harvey. erefore, it was decided to execute a dozen core samples and test them for compressive strength, density, and suitability as a base substrate. ese tests showed that despite the awful appearance of the SPF and the appli- cation inadequacies, the material maintained good cell structure and density. Surprisingly, it would be a good substrate for the appli- cation of a new SPF and intumescent coating system. According to Harvey, Wedge Roofing had never had the opportunity or the need to spray foam over an existing intumes- cent coating, especially in a cold storage environment. "We knew it was time to consult our manufacturer experts. We contacted our go-to intumescent coating manufacturer, International Fireproof Technology Inc., to ensure that the new SPF would tenaciously adhere to the existing intumescent coating," he stated. In another surprising twist of fate, it was discovered that the existing intumescent coating was actually DC 315 manufac- tured by International Fireproof Technology Inc.! is made creating the specifications for the job a bit easier. Wedge Roofing now knew that the product over which they would be applying the SPF was a high-quality, high-performance thermal barrier. However, there was still the matter of the multiple curing periods between the various products that were to be used, especially the multi-day final complete system curing process before the building could be put back into service. "W hen you're dealing with the cure periods of two primers, an intumescent coating, and a silicone topcoat, you need to really strategize and calculate the timing properly. Especially when you're under a tight time constraint and are pushing the curing envelope, you have to be very careful with the curing periods. e last thing we wanted on this job was to have additional issues because of cure miscalculations," explained Harvey. With the focus on optimal parameters for the shortest curing durations, the Wedge crew was ready to mobilize their veteran applicators. "Our applicators are Spray Polyurethane Foam Alliance (SPFA) accredited and extensively trained. When we arrived at Realm Cellars to look at the roof, we saw irregular and inconsis- tent foam thicknesses, combined with a defective spray pattern from a poorly operated and/or dirty gun. e surface characteris- tics were enough to make any professional SPF applicator cringe. The system included a primer, spray polyurethane foam (SPF), a primer again, an intumescent, and a silicone topcoat. The crew wore respirators, gloves, and suits for safety and used fans and containment. COATINGSPRO JULY 2018 27 Specialty Coatings Job

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