Replacing sealed units in aluminium sashes with rubber seals

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Hi everyone,

I am hoping to get some advise on how to replace the sealed units in my double glazed aluminium vertically sliding sash windows. I've already bought the new spiral hangers, so I will be taking the sashes out to change them and was hoping to change out the broken sealed units too (lots on condensation between panes).

So, the windows appear not to have any beading - it looks like the sealed units are held in with the black rubber seals (gaskets?) that have been glued in place around the glass and between the glass and frame. Any attempt I make to get it out just leads to me ripping off the exposed part, so I can't see the profile of the seal (assuming there is one!) And half of it stays in the frame. I haven't found any videos online that explains how to do it.

It would be great if you could advise on the most effective way to approach the task. Is it a rubber seal / gasket? Do I have to cut it out then clean the glue out? Will it be difficult to fit new sealed units? Do I need a heatgun or a putty knife? Is it better to just pay a pro to do it / not do it?

Any guidance would be great appreciated!

Thanks in advance,

Sam
 
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I would say the sashes are screwed together , like a lot of old Aluminium Patio Doors. You should find a screw in each corner, but you won't be able to see it untill you remove the sash from the actual frame. You should be able to get away with unscrewing two sides and the glass will then pull out with the gasket. Upon refitting, to get the gasket back in , use a little glass cleaner , as a lubricant, some use washing up liquid but we find that a little to slippy!
 

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