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Heating and cooling: How to "side" a reclaimed DG unit

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  1.  
    • CommentAuthorMikeRumney
    • CommentTimeJan 19th 2016
     
    We're trying out fixed triple glazing made up of a single pane on the outer face (giant tile basically) with a reclaimed DG unit inboard of the insulation.
    The gap between DG and the outer is about 300mm, which is the thickness of the roof, and it has pipework in place to circulate air through it should condensation strike!
    Here's the rub:
    Whereas one of the two DG units being used is still in its frame, meaning we have a way of knowing which side is outward, (based on assumptions about which way French doors open)
    the other one isn't.
    Does anyone know of markings to look for? or a method of testing??
  2.  
    Pilkingtons once lent us a machine to point at the panes, and it would tell you which one had the coating.

    http://www.surveyorsequipment.co.uk/shop/inspection_detection/glass_analysis_tools/
    • CommentAuthorMikeRumney
    • CommentTimeJan 19th 2016
     
    Well if I can get my hands on one of those ... problem solved!
    Thanks Nick.
    •  
      CommentAuthordjh
    • CommentTimeJan 19th 2016
     
    Somebody somewhere explained how to do this, but of course I forget where and how :(

    Maybe it was something like shining a light through at an angle and looking at the reflections from each surface? Some reflections are green, I think.

    Ideally you want to fill the space between the single sheet and the DG unit with something dry - CO2 from a fire extinguisher perhaps?
    • CommentAuthorMikeRumney
    • CommentTimeJan 19th 2016
     
    Just found some testers for around £50 so might just get or hire one of those, but curious to see what the DIY method would be ... About to start a different thread, but also relating to this is which "boards" would be my best bet for lining the cavity.
    Wish list of characteristics is: water impermeable, vapour impermeable, UV stable, no or very low expansion/contraction, lightweight, easy to cut, and rigid ...
    Not asking for much I know!
    I'm thinking there must be some form of the white foam board or "foamex" (?) as used for outdoor signs??
    • CommentAuthorMikeRumney
    • CommentTimeJan 19th 2016
     
    Update for those interested:
    Holding a torch at right angles to the dg glass gives four reflections of the same colour.
    Changing the angle of the torch will turn the reflection made by a low-e coated surface greener, so this should be the second reflection away, on the outer face of th inner pane.
    Apparently though low-e can also be on the inside face of the outer pane!
    • CommentAuthorEd Davies
    • CommentTimeJan 19th 2016
     
    If it's safety glass of some sort, shouldn't there be a kitemark on the safety side? Would that help?
  8.  
    Posted By: MikeRumneyApparently though low-e can also be on the inside face of the outer pane!

    In which case does it matter which way around it is installed
    •  
      CommentAuthordjh
    • CommentTimeJan 20th 2016
     
    Posted By: Peter_in_Hungary
    Posted By: MikeRumneyApparently though low-e can also be on the inside face of the outer pane!

    In which case does it matter which way around it is installed

    I think there's a convention it's on the inner pane in cold climates and the outer pane in warm climates but I don't remember why.
    • CommentAuthorMikeRumney
    • CommentTimeJan 20th 2016
     
    I'm pretty sure in the UK it should be outer surface of the inner ...
    Is it only one pane that's safety on DG doors?!
  11.  
    Outside of inner pane is correct for UK, yes.

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