Steel windows and doors are field glazed for a variety of reasons.
1. Steel windows and doors are typically heavier than most other products. Installing them without the glass allows the installer the ability to maneuver the unit into position allowing for correct alignment and shimming.
2. When installing a fixed unit, the fastener is installed through the glazing pocket. Installing glass in the factory would require the glass to be removed for installation. This allows the unit to be installed securely without seeing any of the fasteners. The same applies for units that are fastened together. When installing a swinging door to a fixed sidelite the fasteners penetrate though the glazing pocket so they are not visible after the glass is installed.
3. Typically our units are larger than conventional windows and doors and require many hands to move them. With the glass installed it would be virtually impossible to move these massive units with the glass in place.
4. The glass plays an integral role in the stability of steel window and doors. It is important to have the frame installed level, plumb and square. Once this is accomplished the glass can be installed with the proper blocking to ensure correction functionality.