The most common triple insulating glass units are constructed with three plies of glass separated by two hermetically sealed and dehydrated spaces. This construction increases the insulating value of the glass unit, thus reducing the u-value. A triple insulating glass unit is especially useful in applications where a low u-value is necessary.
More commonly, triple insulating glass units are constructed with three plies of glass and two spaces. Uniglass’s triple insulating glass units are available with the same Low-E coatings offered with dual pane insulating glass and the Low-E coating is placed on the #2 surface.