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COATINGSPRO ROOF COATINGS 2017 e SPF (spray foam) roofing market using elastomeric coatings has continued to grow since studies in the 1980s confirmed that SPF roofing systems were sustainable and energy-efficient, saving both money and time.* It is no wonder that this seamless, self flashing, lightweight roofing system has continued to garner more market share over the past 40 years. e 2017 US roofing market was projected at $27.2 billion, with 2-3% of that in SPF roofing- a $544-$816 million segment! e addition of fast-set elastomeric coatings like polyurea improves the life of the coating system and prolongs the recoat requirement to protect the SPF. Equipment selection and performance is one of the most important issues in SPF roofing application, and there are some basic elements that determine if your equipment will have what it takes to process polyurethane foam and polyurea coatings to maximize the physical properties of the system. ese materials react and cure in less than 30 seconds! Inadequate equipment is not an option. In general, large output machines in the 40 lbs / minute+ class are used for roofing appli- cations due to the high capacity they offer- the heaters are specified to keep up with the material flow that is needed, and there is a long heated hose assembly in the 300'-400' range. e first 100' may have a larger ½" hose diameter to keep pressure steady at the spray gun. Pumping systems- what really works? e pumps give the correct ratio to the material and pressur- ize the 2 components for the best mix. Dual-acting, positive displacement pumps are the standard. is type of pump is moving materials on both strokes. Horizontal or vertical pumps will perform, but horizontal pumps are known for keeping a more consistent spray pressure due to less pressure Polyurethane Machinery Corporation One Komo Drive Lakewood, NJ 08701 (732) 415-4400 Plural Component Equipment Essentials for Roofing- PMC Provides the Answers on What it Takes to Process SPF and 2K Elastomeric Coatings fluctuation when the pumps reverse. Hydraulic drive is considered the most reliable. e spray gun needs to be set up with the correct combi- nation of mixing chamber / module and spray tip to make use of the pressure and ratio that the pumps generate. e pump system should be able to maintain the recommended mix pressure during spraying or when the system is "dynamic". W hat to look for is a consistent spray pattern that does not change or diminish when the pumps are reversing direction. What type of spray gun should be used- air purge or mechanical purge? Mechanical Purge guns like the PX-7 are the gun of choice for roofing. Instead of air, they have a valving rod that allows the material to flow and mix. W hen the gun trigger is released, the valving rod stops the flow of materials and clears the mix module of material. Air Purge guns like the AP-2 will send a blast of air into the mix chamber and out of the nozzle immediately after the trigger is released to purge any remaining chemical in the gun. Air purge guns are simple to operate and maintain. Each type of gun when properly set up and maintained will spray SPF with success. *Resources: Spray Foam Polyurethane Alliance (SPFA) National Roofing Contractors Association (NRC A) Oakridge Laboratories US Navy By Murph Mahaffey- Director of International Sales, Polyurethane Machiner y Corporation Company Profile: Polyurethane Machinery Corporation SPONSORED CONTENT

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