Glass Minimum and Maximum Sizes

To determine the minimum and maximum sizes available for finished glass products, the glass fabricator must be consulted. Physical/mechanical capabilities and constraints of the fabricator will affect the final finished glass size availability.

Generally speaking, the most available (and economical) width is 60" or less, because it can be heat-treated on a high-speed furnace. Widths of 60" to 84" are available from a number of fabricators, a few of which can handle widths up to 96". As the size increases, the cost is likely to be higher.

As a rule, once the insulated glass unit’s (IGU’s) total size exceeds 50 square feet, the number of potential fabricators drops due to equipment or other limitations, and the cost may increase significantly. For these reasons, we always recommend that you consult with an independent Guardian Select fabricator ahead of time to make sure the glass you’ve specified will be available and will fit within the project’s budget.

Special considerations for oversized glass: IGUs and heat treatment

It’s important to understand that not all fabricators are equipped to process and/or heat-treat standard glass sizes. Minimum and maximum sizes are dictated by:

The size of glass available from the primary manufacturer

Any limitations in the fabricator’s equipment

The capabilities of the contract glazier

Availability of specialized shipping and handling equipment (particularly for oversize units)

Specific glass type: silk-screened, heat-treated, laminated, etc.