A well designed warehouse, manufacturing or distribution facility contributes to the triple bottom line of the companies that own and operate these facilities by reducing the operational costs of the building; minimizing the environmental impact of the building; and providing a healthy and comfortable environment for the employees working in the building. When planning a new warehouse, manufacturing or distribution facility, an important consideration is reducing the energy use intensity of the facility. Every effort should be made to reduce the amount of energy used to heat, cool and light the interior of the building. This will not only reduce the impact of the building on the environment but also reduce the operational costs of the building. The building envelope, i.e. the walls, roof, windows and doors of the building, should be designed to minimize the transfer of heat. The R-value of the insulation in the walls and roof should be maximized to reduce the flow of heat through these assemblies. The building envelope should be carefully detailed to reduce thermal bridges where conductive building materials allow the flow of heat to bypass the building insulation. A continuous air barrier should be provided to minimize the uncontrolled flow of air along with the energy used to heat and cool that air through the building envelope.