The glazier inspects the existing frame for warping, rust, or damage. In many cases, the frame can be reused if it is structurally sound.
For custom sizes, the new glass is measured to allow for proper expansion gaps. Many commercial replacements use pre-tempered glass ordered to exact specifications. storefront glass replacement
The glass is carefully placed into the frame using suction cups and setting blocks. Glazing beads or stops are reattached to lock it in place. The glazier inspects the existing frame for warping,