From that figure out what size glass block you should use and how many you will need to complete the project.
How to replace a glass block window with a regular window.
Remember to take into account the 1 4 to 1 2 inch gap that is required on all sides of the glass block window for the mortar.
Press in new glazing points every 10 inches with the tip of a putty knife.
The good news is that homeowners do not need to worry about removing the entire window since they can easily remove the damaged glass blocks and replace them with new ones.
Use a caulking gun and squeeze a thin layer of window glazing compound in the primed grooves.
Glass blocks cannot be cut so you need to be exact with your measurements.
Measure your window opening.
Press the new window glass lightly to bed it.
When the panel is positioned have your helper insert a third wedge near the center of the panel from inside.
With the help of a friend set the new window glass in place.
Before you set the glass block window panel in place screw a block to the underside of the sill plate.
Measure at all four corners from the face of the panel to the outer edge of the rough opening.