A storage shed including one or more extruded wall uprights, one or more blow-molded wall panels, one or more extruded corner uprights including a first corner upright a second corner upright, a blow-molded first door jamb panel, and a blow-molded second door-jamb panel. Some of the extruded corner uprights, some of the one or more extruded wall uprights, and some of the one or more blow-molded wall panels are collectively configured to, when assembled, directly attach to one another to form a sidewall or a rear wall of the storage shed. The blow-molded first door-jamb panel is configured to directly attach to the first corner upright and the blow-molded second door-jamb panel, spaced apart from the first door-jamb panel, and configured to directly attach to the second corner upright.

A storage shed including one or more extruded wall uprights, one or more blow-molded wall panels, one or more extruded corner uprights including a first corner upright a second corner upright, a blow-molded first door jamb panel, and a blow-molded second door-jamb panel. Some of the extruded corner uprights, some of the one or more extruded wall uprights, and some of the one or more blow-molded wall panels are collectively configured to, when assembled, directly attach to one another to form a sidewall or a rear wall of the storage shed. The blow-molded first door-jamb panel is configured to directly attach to the first corner upright and the blow-molded second door-jamb panel, spaced apart from the first door-jamb panel, and configured to directly attach to the second corner upright.

A mold insert is disclosed for use in forming a structure cast in a form having a magnetic receptive portion. The mold insert includes a first mold insert member having a body portion and a first mating member. A second mold insert member includes a body portion and a second mating member. The first and second mating members are engageable to enable the first and second mold insert members to be configured in each of a joined configuration and an unjoined configuration. At least one magnet member is removably engageable to at least one of the first and second mold insert members. The magnet member, when engaged to the male insert member is configured for magnetically adhering to the form.