Abstract: Metal cladding as jamb cover assemblies and mullion cover assemblies, for door frames and mullions, using extrusions as cladding over substrates. A jamb cover assembly includes a jamb plate, a nosing, and a nailing fin. The nailing fin extends from a distal side of the assembly. Accordingly, the frame can be secured in a rough opening of a building with the nosing assembled to the jamb plate, and using the nailing fin for the securement, without any assembly or disassembly of the frame at the construction site. Regarding the mullion cover assembly, first and second jamb plates are on opposing sides of a mullion substrate. A mullion nosing is assembled to the jamb plates, and bridges the jamb plates to join together the two jamb plates and the nosing, to provide complete overlayment of the outer surface of the mullion substrate and to space the front panel of the nosing from the outer surface of the substrate.

Abstract: A door frame which employs jambs or jamb assemblies which are essentially devoid of wood and other materials which are susceptible to being damaged by the affects of weather. The side jambs are fabricated of e.g. extruded aluminum moldings which extend an underlying floor/substrate to the header, and can be fabricated from a common-profile extruded aluminum molding. The jambs can also have an e.g. polymeric insert assembled thereto which can receive nails or screws, optionally without pre-drilling, in a similar manner as wood receives nails or screws. The jambs can further include a nosing either integral with, or snap assemblable thereto. The molding can further include a nail fin kerf which accepts a rigid or a flexible nailing fin.