What year did glass change in house windows .from the old glass to what we have today with out blemishes and?

old glass had pits and waves and new glass in windows today is smoth with no flaws , When did it change?What year did glass change in house windows .from the old glass to what we have today with out blemishes and?
Modern ';plate glass'; began to be used in residential construction in the 1940's and all but replaced the old ';float glass'; by the early 1960's.





There is still a lot of old float glsss out there. It is worth recycling because many restoration specialists seek it out for projects in historic houses or period restorations. In fact, some neighborhood historical districts prohibit the use of plate glass and mandate the use of float glass in order to preserve the look of the neighborhood.