Cladding can mean several different things. Cladding as siding includes vinyl siding, wood siding, cementious (“Hardy Board”) or aluminum siding. Cladding for windows and doors refers to the vinyl or aluminum skin used on the outside in place of paint i.e. “vinyl clad” or “aluminum clad.” Cladding in general can refer to skylights, glazing, glass block, shutters or any other external protection device.