PBR Panel - 26 Gauge. Product Details. The R-Panel features a 1 1/4 inch high rib on twelve inch centers with intermediate stiffening ribs. Used for both roofs and walls, the R-Panel is one of the most versatile panels on the market due to its strength and handsome design. The R-Panel; is being used in commercial, industrial and residential applications. Available in 26 gauge. The PBR Panel stands for Purlin Bearing Rib Panel.