Unlike adhered roofing systems where the membrane is secured to the system using adhesive, the Sarnafast system secures the membrane using fasteners within the membrane seam overlap. Typically called an “in-seam" attachment system, after the plates and screws secure the edge of the membrane, the next sheet overlaps the fasteners and is made watertight by hot-air welding the seam. Unlike typical in-seam systems, Sarnafast uses a specially designed oblong shaped discs, “Sarnadisc XPN" instead of a standard circle plate for increased performance.
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