Thermafiber® Impasse® Curtain Wall Perimeter Fire Containment System is a patented design that streamlines the installation of curtain wall insulation by changing the order of traditional installation steps to fit a logical progression and take full advantage of the fire resistive, enhanced acoustical performance, and vapor barrier properties of Thermafiber® FireSpan® and Safing insulations. Traditional curtain wall insulation systems call for installation of impaling pins on spandrel panels before installation of insulation. The insulation is then impaled onto the pins. The Thermafiber® Impasse® System is unique in that the hangers are inserted into the insulation before the insulation is installed into the panels.