The 24 inch aluminum flashing roll white refers to a white aluminum flashing coil of 60.96cm wide, or 609.6mm wide. Regular alloys and tempers for it incorporate A3003H24, A3004H26 and A3003H24. Although thicker and thinner ones can be customized, most aluminium flashing rolls are between 0.6mm and 1.5mm thick, for there’s no need for thicker materials unless in special roofing …