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42 SURFACE PREP 2018 COATINGSPROMAG.COM Moisture Monitoring readings are visualized on the meter face and recorded by the operator. Identified areas of comparatively high moisture content can then be analysed in more detail. Point-of-contact scanning is carried out using a handheld scanner and can be used in difficult-to-access areas of roofing and waterproofing systems or on smaller surface areas using the grid-format system. Point-of-contact readings can be taken at each grid intersection and then further scanning can be carried out in areas of higher moisture detection. EPDM has traditionally been known to cause difficul- ties for electrical impedance meters; however, recently, more users are having greater success with many EPDMs, possibly due to the reduction of carbon black in these membranes in recent years by manufacturers. e impedance/capacitance method allows the person doing the inspections to find the extent of moisture damage to a roof system, including how far the moisture has spread and in what concentrations, as well as finding the location of where the moisture is entering the system through pin holes or poorly installed and damaged seams. ese methods are ideal for use on concrete, wood, and metal decks, with the ability to increase or decrease the depth of reading to suit the roof construction; read through liquid applied, asphalt, single ply, certain types of EPDM, thermo- plastic polyolefin (TPO), and poly vinyl chloride (PVC) roof systems, among others. A Simple Scan A simple scan can be performed after installation of a system to ensure the integrity — once some rain has been experi- enced — and an annual, or regular, inspection of the roof should be carried out to ensure that increased levels of moisture are caught before causing more serious problems. W hile specialist knowledge and experience is invaluable for fully diagnosing conditions of a damp roof, a basic scan can be performed by the building or facility management with basic training. Regardless of whether a contractor, a third-party inspector, or the facility management does the work, these scans can save the roof or waterproofing system from a shortened lifespan, thereby providing huge savings of cost and distress for the building owner. CP Kelvin Rynhart is sa les manager for Trame x Moist ure Meters, which desig ned and developed t he world 's f irst non-dest r uct ive moist ure meter using Imped ance technolog y. Trame x Moist ure Meters cont inues to manufac- t ure professiona l qua l it y inst r uments specif ica l ly for moist ure mapping and measur ing of bu i ld ing mater ia ls for water d amage restorat ion technicians. A f ter many years as sa les manager of Trame x Moist ure Meters, Ry nhar t has developed a comprehensive v iew of moist ure test ing f rom inter nat iona l stand ard s. For more infor mat ion, contact: Trame x Moist ure Meters, (800) 234 -58 49, w w w.t rame x Although scans can be basic, it's important to have the person who'll be doing the scans be trained properly. This person can be a contractor, facility management, or third-party inspector. Completing a basic scan can help keep the roof and any waterproofing systems from failing prematurely. This, in turn, can help the owner save money and avoid distress down the line. Scanning a roof using the impedance/capacitance method can help determine the extent of the moisture damage, where the moisture has entered the system, and how far the moisture has spread.

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