On all glass units; clear laminated glass will be provided as the interior lite in tempered or heat strengthened make up as structurally required. The inner lite on all plastic units will be of a clear material of the same type as selected.

In most residential instances, double glazing or insulated glazing is used in skylights. Refer to the chart for a guideline as to the relative heat loss/gain (U-Value) of single vs. double glazing. Single glazing is initially more economical where heat loss/gain is not a primary concern.