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How to Replace a Glass Pane in an L-Bracket Metal-Frame Window

The trickiest part of replacing glass panes in L-bracket metal-frame windows is getting replacement glass that’s sized exactly right. To replace a pane in an L-bracket metal-frame window, you must measure the precise length and width of the grooves in which the pane will fit.

Tip: Have the new glass cut so it measures 1/8 inch shorter than the exact groove dimensions in both the length and width. This creates a 1/16-inch gap on each side between the edges of the pane and the groove. The gap provides room for the glass to expand when the weather changes.

Some metal frame windows are held together by L-brackets placed at the four corners. The faces of these frames are dimpled over the L-brackets. To replace the broken pane, you have to remove only one side.

In addition to the replacement glass pane, you'll need a drill, nail set, and hammer.


Drill a hole in the depression at both ends of one side of the frame.

Use a bit slightly larger than the diameter of the depression.


Carefully remove any broken glass from the frame.

You'll need to pull the sides of the frame apart to access the glass. Be sure to get all the small shards out.

Warning: When you work with broken glass, Wear safety goggles as well as gloves; small chips of glass can cause permanent eye damage.


Slide the new pane into place.

Make sure that the new glass is fully seated into the gasket surrounding the glass.


Push the sides of the frame back together.

Press firmly enough that the L-brackets are in place and the joint is tight.


Create a new dimple in the metal back over to L-bracket.

Use a hammer and a small nail set or punch to dimple the metal back over the L-brackets and lock the frame together.

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