Insulated glass these days is usually 3/4 to one inch thick and too bulky to fit into metal frames made to hold single pane glazing.

Q: I have a large kitchen window that was installed around 1986. I don’t recall the manufacturer, but it could be Andersen. The window is single-pane glass with 16 panes, eight over eight, with ...

A single-pane window is usually built as true divided lit, meaning the window sash has a grille pattern that separates the individual panes of glass.

The fact is, all single-pane windows need reglazing periodically. Replacing cracked putty will save energy and prevent rot from invading your windows.

Learn how to choose replacement windows for your home with advice on window types, installation, features and brands including Andersen, Marvin, and Pella.