Refrigerator casings and joint members therefor are provided. A joint member includes a body extending between a first end and a second end generally along a lateral direction. The body further includes a forward face and an aft face spaced apart from the forward face along a transverse direction, and further includes a top surface and a bottom surface spaced apart from the top surface along a vertical direction. The joint member further includes a plurality of barrier channels defined in the body, each of the plurality of barrier channels extending generally along the lateral direction between the first end and the second end. The joint member further includes a plurality of tube channels defined in the body, each of the plurality of tube channels extending generally along the vertical direction between the top surface and the bottom surface.