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Doors, windows, skylights and foundation are the other components that must be considered carefully to complete an efficient design. Roofs and walls are not the only components considered part of the envelope, though they typically represent the largest surface areas. "Since the insulation in the roof and walls in metal building solutions is often exposed, the acoustical performance and aesthetics of these assemblies plays an important role as well. "To be a true energyefficient envelope, it must minimize air infiltration which can have an adverse affect on indoor air quality and rob the building of valuable conditioned air which in turn increases energy costs," says Mark Engebretson, director of marketing and business development, Th erm-All Inc., North Olmsted, Ohio. "Before one can have good control of energy efficiency, there must be functioning barriers in the envelope for air, water and heat."Įnergy-efficient envelopes produce a controlled environment enabling occupant comfort and energy cost reduction. "Infiltration directly relates to how effective the building envelope will be in providing air and water tightness in the roof, walls and other envelope components such as windows, doors and flashings," says Brad Rowe, national marketing manager, Thermal Design Inc., Madison, Neb. Two primary energy-efficient envelope functions are air infiltration and thermal performance. "In a retrofit situation, additional insulation can easily be added during the renovation process."

"In new construction, energy concerns or improvements can be made by adding insulation in both roof and wall assemblies," says Jim Bush, vice president of sales and marketing, ATAS International Inc., Allentown, Pa. The design of metal buildings makes them very compatible with energy-efficient envelopes allowing for a fast and economical blend of energy-efficient applications that starts with the erection process.Īn energy-efficient envelope is the foundation upon which all other systems are designed to fit. The basic function of any building's energy-efficient envelope is to separate the outside environment from the building's interior.