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  • I see the desire to do it, personally I'd try and cut out the routering even if it means adding spacers to keep the metal guard further away from the door, just because it's adding a whole other stage.. but however it's done I think it can be done while the door is still hung

  • Am I right in thinking that I can use just putty without beading? I’m less concerned about the metal guard - more about having enough space in each frame to hold the much thicker sealed unit in from the back (i.e red line in my diagram) as currently single pane. I guess routing should be possible without taking the door off..

  • Am I right in thinking that I can use just putty without beading?

    https://www.slenderpane.com/slim-double-glazed-units/glazing-methods

  • Both putty and beading. the only differing factor is mounting the beads to the door face not in the rebate (having the glass almost flush with door will be a bit odd) and the putty to avoid the mm tolerance the tape will need .. potentially the beads could be done in whole vertical strips avoiding a few cuts and joins. . But also can't see why routing wouldn't work , the extra useful bits needed just add up either way

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