Back home, she examined the window. On the interior side, she found thin vinyl or aluminum strips holding the glass in place—the glazing beads. She slid a stiff putty knife into the seam and gently pried. Snap! The first bead broke. She learned the hard way: start at the middle of the longest side, not the corner. The second bead came off cleanly. She labeled each piece (Top, Bottom, Left, Right) with masking tape.
Replacing the glass in a double-pane window—technically known as an (IGU)—is a precise task that involves removing the entire sealed unit rather than just one pane. Because these units are factory-sealed with insulating gas (like argon) to provide thermal efficiency, they must be replaced as a single component once the seal is broken or the glass is cracked. Essential Tools and Materials how to replace a double pane window glass
Put the window sash back into the main frame and test the operation. It should open and close smoothly. Back home, she examined the window