- Saddle Bar
- Reinforcing Bar (Rebar)
- Steel Core or Steels
- Zinc Section
Saddle Bars are the strongest method of support and are used in large external windows for preventing panels from sagging. They also resist wind pressure in exposed situations. Saddle bars form part of the support structure of the window. These bars, often in the shape of a sideways “T” (and so sometimes called T-bars) are fixed to the perimeter of the opening and so transfer the weight of the glass to the sides of the opening.
Rebar is used to prevent a panel from bowing but do not give support where multiple panels are assembled. Saddle bars are preferable in these circumstances. Rebars are normally round bars that are attached to the panels by twisting copper ties that are soldered to the panels.
Steel core takes two forms - either steel-cored lead or steel strips fitted in the lead cames when leading. They are mainly used in domestic glazing where support is required particularly in leaded lights with diamond panes when they are inserted in the continuous diagonal leads.
Zinc section is often used to frame a panel that is not glazed into a window or frame. It gives a panel strength for ease of handling, but does not resist sagging or bowing.