I would love to have one of these Qube garden rooms. Just think your own retreat, gym, or office right in the back yard! Qubes are constructed from Structural Insulated Panels (SIP) on a concrete pad. SIPs are environmentally friendly for a few reasons. The outer skins are made from engineered wood derived from renewable forest resources. The foam insulation saves on heating and electric bills, and SIPs replace conventioanl frame construction.