IGU replacement in Aluminum window frame


Old 09-14-11, 03:33 PM
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Join Date: Jun 2008
Location: Canada
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Question IGU replacement in Aluminum window frame

I have a failed IGU (insulated glass unit - dual pane) in an older aluminum window. I have another good IGU (from a spare old frame) that I wish to substitute for the failed unit.

When I try to separate the IGU from the frame it is stuck to it by a black sealant. I tried using a breakoff knife and putty knife but they don't work.

Without breaking the IGU, what is the best way to release the glass unit from the aluminum frame?

Last edited by Gardenpath; 09-14-11 at 03:58 PM.
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Old 09-14-11, 03:45 PM
XSleeper's Avatar
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Join Date: Dec 2004
Location: USA
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graziers use a thin glazing tool, but maybe you could use a linoleum knife, paring knife or even a cheap pizza cutter bent at an angle. heating the perimeter with a torch might help soften up hard glazing too... but too much heat can break glass so be careful. you would obviously remove the glazing strips [stops] to give the glass room to move away from the glazing. often the glass breaks despite your most careful efforts so dont be suprised and lay down a dropcloth just in case. if the old igu is shot anyway dont try too hard to save it.
Old 09-15-11, 04:34 AM
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Join Date: Jan 2000
Location: USA
Posts: 1,919
After doing all this work, you may find that the insulating glass unit may fail in a shot time since it was made at the same time as the other. Buy a new one which comes with a guarantee.

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