In 1996, approximately 37,000 modular homes and 110,000 panelized units were produced. All types have seen a steady increase in recent years, and continued growth is predicted. Modules are 90-95 percent complete when they are shipped from the factory to the building site to be affixed to a conventional foundation. Open wall panels are wall sections containing exterior sheathing only. Plumbing, wiring, insulation, and interior sheathing are installed at the building site.
Most panelized homes are open wall systems.
Closed wall panels have exterior walls finished with insulation, electrical, and plumbing systems installed. Geodesic dome homes are constructed of triangular panels, creating an energy efficient home that maximizes living space using a minimal amount of materials. Buckminster Fuller was the first to formulate geodesic principles for dome construction. Thermal mass characteristics of log walls make log homes as energy efficient as conventionally insulated walls. Solid wood homes are one of the most environmentally-compatible housing choices because of their thermal mass characteristics and the renewability of the building materials.