Muntins are thin, spindly and easily breakable. For this reason, whether you have lead muntins, wood muntins, or the imitation-muntin look of most modern windows, it is very likely that you will encounter a broken muntin at some point. Don't worry though! Broken muntins don't require window contractors or major projects usually. Here's what typically will go wrong with a muntin.
Often, a muntin will loosen from its attachment to adjacent muntins. If you notice this happening—either pulling apart or becoming less taut—you can try applying some wood glue or a touch of vinyl glue, depending on what your window muntins are made of. If glue is not effective, use a small brad, tack or staple, but try to avoid using a nail. Too much pounding or a nail impacting nearby glass is going to cause more problems than just a broken muntin.
Breakage Under Impact
Other times, a muntin will just break under impact or from repeated closing and opening of the window. You will need to replace the muntin by crafting your own muntin (if you’re handy with wood) or by ordering a replacement grid or pane assembly from the window manufacturer.
If your windows are composed of real muntins, the process of replacing them and crafting new muntins is a time-consuming and labor-intensive task. Muntins, especially old ones, do not come in a one-size-fits-all package; thus, custom muntins must be made individually for each window.
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