If you are in doubt concerning where the masonry is in relation to the current frame, take several pictures of the window and take them to the fabricator for your glass panels. They can give you a more proper estimate. [2] X Research source Always measure twice. Getting the right dimensions is crucial.
Since fabrication won’t be a same-day process, it is recommended that you leave the current window installed until your block panels are ready. If your panels aren’t being delivered directly to your home, you may want to request a band clamp around the windows. This will help you transport them with less risk of snapping any of the blocks off the larger panel. [3] X Research source
If the jambs are set in concrete or mortar, chisel some of it away to ease removal. When dealing with metal frames cast in the concrete, it is usually best to leave these in place. Ask your glass fabricator for suggestions. [5] X Research source
Install the shims at 3” (7. 62cm) intervals, moving away from the corners.
Allow it to set, hard to the touch, before mortaring the sides. From inside, scrape away any clumps of mortar with your trowel. [8] X Research source
Slide all of your shims out and finish mortaring the gaps once the mortar has set. Allow the mortar to set for two hours and then smooth it out with a striking tool. Clean any excess mortar off the panel with a sponge while it is still wet.
