Because of the narrow stiles and rails of steel doors, the lock box typically cuts into the glass. The notch in the glass is large enough for the body of the lock box. Then the sub-escutcheon and escutcheon cover the lock box and transition into the glass.

When designing the doors for a project there are a number of options of how this projection is treated. When the door has a single large pane of insulated glass, the choice is really just the size of the overall escutcheon cover relative to the scale of the door. When the door has divided lites, then the choice becomes the relationship of the escutcheon to the breakups in the glass. The balance in the use of escutcheons, TDL's and their relation to lever heights becomes the design challenge. In many projects the lite pattern, and thus the escutcheon and lever locations, become the driver for horizontal alignment of all the windows and doors throughout the entire project.

The other challenge we face with today's steel doors is the use of the insulated glass.  By design the insulated glass has a colored spacer bar between the two lites of glass and this glass edge needs to be hidden whenever possible.  Tucking the lock box below a TDL will always help hide the appearance of the corner of the insulated glass.  Planning the lock box height and relation to TDL's in the initial design is recommended.

Escutcheon Design Layout

The following group of door pair elevations is a sampling of the variations possible with escutcheons. The grouping shows that the alignment of the divided lites, in combination with the escutcheon method, control the lever height options. This group shows primarily "three lites" high divided conditions. Four lite high divisions would create another series of conditions. Maintaining consistent handle heights with variety in door heights and divided lite heights is the design challenge.

There are a lot of subtleties that come into consideration when choosing a layout. Our cad department is available to sketch out different scenarios to help define the best solution. Or, here is a quick list of variables that would be considered to layout a design:

1. Desired handle height

2. Desired layout of the breakups in the glass (if divided lites)

3. Size of the body of the lock box. (to allow proper clearance from glass and divided lite bars)

4. Key above or key below the handle (typically it is key below except for commercial egress lock box)

5. Escutcheon length and location of the escutcheon.

6. Maintain needed clearance for the lock box itself. (see lockbox size guidelines in illustration)

Energy Values
Thermal Design
Divided Lites
Hinges & Finials
Door Sills