The walls are made from SIPS or Structurally Insulated Panels, sometimes referred to as “Sandwich Panels” or EPS panels (Expanded PolyStyrene). A polyurethane foam core is wrapped in a painted sheet metal layer front and back that forms each individual panel. They are super strong and light. Those panels are locked together using a tongue and groove type connection system to form the walls. Those, in turn, are placed in a solid steel frame to make a remarkably strong and very well insulated structure. All the wall components of a Houdini house come pre-assembled with the doors and windows in place.
The standard wall is approximately 2 inches thick and has an R8 rating for insulation. Most of our homes are available with an upgraded package for better insulation that will increase the walls to 3 inches with an R20 rating for insulation. This upgrade also increases all glass windows and doors from single pane to double pane glass. This is perfect for hot and cold weather climates.