Replacement Glass for Custom Windows
Finally bought a home; now the fun starts. We have a large north facing (no direct sunlight) window in my living room. This window is roughly 16 feet wide by 6 feet high. It is made up of five 3' wide panes of single pane plate glass (old 1952 house) with wood dividers between the panes (maybe 2-3" each). The window starts less than 18" from the floor, so CA code says they should be tempered glass. We have a rambunctious 22 month old so I am either going to use a 3M safety film or install tempered glass. However, my wife wondered if we could add thermal protection as well.
The window is stationary with no opening mechanism. There is a 1.25" inside stop and a ~2.5" stool (not sure if I have all of these term correct). It seems like there is enough room to add a 0.5" thick glass adn remove 0.5" from the inside stop.
Would this work? Can you buy low U-value glass for this type of custom replacement? If so, from where?