Roy O. Martin unveils its new line of STRUCTWALL and STRUCTWALL XL Structural One rated OSB Sidewall Panels. The company says these panels are engineered for greater strength and less deflection than conventional OSB sheathing. STRUCTWALL OSB sidewall panels are available in 96-, 108- and 120-in. lengths, and 3/8- and 15/32-in. thicknesses. The XL panels are available in 97-1/8-, 109-1/8- and 121-1/8-in. lengths, and 3/8- and 15/32-in. thicknesses.