Vacuum insulation panels (VIP) offer higher thermal resistance per unit thickness than traditional insulation materials. This means a building envelope can meet the effective R Values for the enclosures required by the energy codes without having to increase the thickness of walls roofs or floors. This course discusses how VIPs work, why they are effective and the impact the properties of the materials used to construct a VIP can have on its performance. VIP installations and the latest developments in VIP technology are reviewed to illustrate the advantages of using VIP's as thermal insulation in the design of energy-efficient buildings