How Manufactured Homes' Walls Are Constructed Studs are wood planks that are used to construct walls. In a prefabricated home, studs are the vertical planks that are typically 2" x 4" and spaced every 16". The studs are attached with screws or nails at each floor and ceiling plate. The term "stud" can also be applied to the horizontal members that run parallel to the floor and ceiling inside the wall cavity. These are usually 2" x 4" boards as well but may be 2" x 6" or 2" x 8". The studs are placed 12" on-center on top of one another with the flat sides together. A sheet of plywood or other material is then placed over the studs and nailed or stapled to both. In addition to the vertical and horizontal members that make up the frame of a manufactured home, there are also crossmembers positioned between the frames of adjacent rooms. They serve to connect the two frames together and provide stability when loading the home onto a transport trailer. Crossmembers are typically made from 2" x 4" lumber and are attached to the frames with lag screws or nails. There are several types of manufactured housing, including mobile homes, modular homes, and recreational vehicles. Mobile homes are manufactured in a factory and shipped in pieces to your site.