Walls also can be built to include shelves, benches and sculptures. Windows are set into the cob, and wiring and plumbing can be run into conduit pipes or directly through the walls. Cob walls are fireproof, and ovens can be built with cob, too, Hauk said. Relief sculpture and mosaic tiles also may be applied during the plastering phase, creating designs in the walls. Roofs for cob buildings are constructed like those for any other structure.
Cob is an affordable construction method that utilizes recycled materials.