Quad-Lock System PanelsQuad-Lock Panels are shape-molded out of fire-retardant expanded polystyrene (EPS). each panel is 48″ long x 12″ tall, scored and slotted every 2″ for easy measuring, cutting and tie placement. Regular Panel Pair Each Panel is 2 1/4″ thick Regular FS Panel Pair Same as Regular Panels, except with 1 1/2″ Fastening Strips embedded every 12″ Ultra Panel Pair Each Panel is 3 1/8″ thick Ultra Corner Panel Pair Same as Ultra Panels, except with a 1″x3″ Full Height Recess Plus Panel Pair Each Panel is 4 1/4″ thick Panel Pair – Plus FS Same as Plus Panels with 1 1/2″ Fastening Strips embedded every 12″ on center Extra Panel Extra Panels are used to add insulation value to the existing panels. They are reversible (in all directions) and are added to the inside of the Regular, Ultra, Plus or FS Panels. Quad-Lock Wall ConfigurationsEPS is considered to be world class insulation with qualities that makes it impervious to time and moisture. EPS is inert and chemically stable and will not emit any gases into living areas under normal use. R-22 (RSI – 3.83) R-43 (RSI – 7.49) R-28 (RSI – 4.85) R-53 (RSI – 9.09) R-38 (RSI – 6.44) R-59 (RSI – 10.13)