Dual glaze, Low-E glass is usually the choice for exterior French doors to provide improved insulation while interior French doors require only a single glaze glass. In both cases, and as an industry standard, glass in French doors is tempered.

There are many reasons to consider including French doors in a house. When used as patio doors, French doors provide view to the exterior environment while enabling the penetration of natural light into the house. When used as interior doors, French doors help give rooms a cheerful, airy look while providing a visual bridge between two adjacent living areas. French doors are slightly more expensive than other types of doors, but they are often considered to be a wise investment.  Often associated with an “upscale” appearance, French doors typically increase the home value or its curb appeal.

French doors are available from natural wood, aluminum-clad, fiberglass and aluminum.