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Learn about Double Pane Window

Double Pane Window

Double pane windows have two pieces of glass separated about 1/3 inch apart by an insulated spacer. The space is usually filled with a gas such as argon that is heavier-than-air and reduces convection between the panes.

When a window is described as being single, double, or triple-pane, it means the window has one, two, or three panes of glass. Another term for double is double-glazed.

Unlike a single pane window, a double window has two panes of glass. The two pieces of glass are separated about 1/3 inch apart by an insulating spacer. Space is usually filled with a gas such as argon that is heavier-than-air and reduces convection between the panes.

Double pane windows have improved insulating value over older, single pane windows. On an old home with deteriorating, single pane windows, an upgrade can also reduce drafts through and around the window.

There is a long-standing myth that says that glass acts like a very slow liquid and flows slowly over the years, evidenced by the fact that the bottoms of window panes in old cathedrals are thicker than the tops. Researchers have proven that this is in fact not true. Glass does not flow. Glass production methods in past centuries made one end thicker than the other, and workers tended to install the heavy ends at the bottom. Modern glass is consistent in thickness, and will stay that way indefinitely.

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