Sorry I did not post this earlier, but I think that for some applications, glass brick make sense. What is the R-value?
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The R-value for Premiere Series glass block is 1.96, which is more than twice the value for flat 1/8" sheet glass windows or roughly equivalent to a double pane thermal window. The ThinlineT Series R-values are slightly lower at 1.75.
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Glass Block Sales, Inc.
Have a great day!