Noticed tiny cracks on the inside of the blocks, and have never seen this before. After a little research, found a manufacturer site that said using harsh cleaners like Tilex or ones with petroleum products could cause cracks over time and void the warranty.
It also says not to clean blocks in the hot sun (the window faces west)
Just thought I’d share this info in case someone runs into this.
So are you checking the framing and structure to make sure they are using lintels for support ?
In Chicago builders seem to think Glass Block is structural the idea of weaker plastic blocks makes me nervous ,not to mention the limited life.
Glass stays clear over time however any plastic gets that cloudy-yellow shade over time and looks terrible.
Those two facts alone make me give the product a thumbs down.
Well, if glass WAS cheaper, wouldn’t the contractors use it? I have NEVER seen a GC use something that is more expensive in tract homes than they can get away with.
By the time they pay a mason to install the glass blocks in mortar, I’m sure the plastic pre-fab would pencil out to be less expensive.
Actually, there may be another reason and that is energy efficiency. Plastic is less conductive than glass, and the acrylic windows are more efficient.