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Finding u value for my double-glazed units

  • 07-07-2018 7:23pm
    #1
    H.E. Pennypacker
    Closed Accounts Posts: 844 ✭✭✭


    I have Munster Joinery PVC windows some of which were fitted in 2008 and some of which were fitted in 2013. The 2008 units have a silver bead between the two panes of glass whereas the 2013 units have a matt black bead between the two panes of glass.


    Is there any way of finding the u value for these units and if they are air or gas filled?


    Thanks in advance


Comments

  • #2
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    H.E. Pennypacker wrote: »
    I have Munster Joinery PVC windows some of which were fitted in 2008 and some of which were fitted in 2013. The 2008 units have a silver bead between the two panes of glass whereas the 2013 units have a matt black bead between the two panes of glass.


    Is there any way of finding the u value for these units and if they are air or gas filled?


    Thanks in advance

    Check the silver bead for printed text, and post here what it says


  • #3
    H.E. Pennypacker
    Closed Accounts Posts: 844 ✭✭✭H.E. Pennypacker


    sydthebeat wrote: »
    Check the silver bead for printed text, and post here what it says

    KM 30858 26.10.2006 1025 0463 m.j.en1279.km.30858 72904 4453-02

    That’s from one unit. Some of the numbers differ slightly in the other units. If there’s a particular significant number I check the other units for it


  • #4
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    H.E. Pennypacker wrote: »
    KM 30858 26.10.2006 1025 0463 m.j.en1279.km.30858 72904 4453-02

    That’s from one unit. Some of the numbers differ slightly in the other units. If there’s a particular significant number I check the other units for it

    One of those is the order number from MJ.
    Contact them and give them that whole sequence and they should be able to tell you what the order number is and thus what the window u values are.


  • #5
    H.E. Pennypacker
    Closed Accounts Posts: 844 ✭✭✭H.E. Pennypacker


    Just to follow up, the info back from Munster Joinery on the earlier units was sparse, whereas they had formal testing for the later units, performed in 2009.


    The earlier PVC windows are rated as 1.9 W/m2K with 24mm 90% argon filled double glazed units (low E, En= 0.15 hard coat, default DEAP values recommended) and no rating on the glass itself. We have an issue in that the part of the house (south facing) with these windows in that it gets uncomfortably hot in sunny weather - every year, not just this one. No real problems in winter but it may have oversized radiators... Given the above spec, is it worth looking at replacing the double glazed units (not the PVC frames themselves), with something higher spec from Energlaze or the like, or is it just marginal gains at that stage? I don't mind paying a bit to increase comfort but there would need to be some gain.


  • #6
    Metric Tensor
    Registered Users, Registered Users 2 Posts: 3,725 ✭✭✭Metric Tensor


    Replacing them will help a little with solar gain but I doubt enough to make it worthwhile.

    A brise soleil of some sort would probably be more helpful. Could you install some sort of timber awning / or roof structure outside the window that will shade the window from the high summer sun but not block the low winter sun.

    Something like:

    http://hoohead.com/wp-content/uploads/2017/11/Pare-Soleil-Baie-Vitrée-Galerie-Avec-Brise-Soleil-Menuiseries-Images.jpg


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  • #7
    H.E. Pennypacker
    Closed Accounts Posts: 844 ✭✭✭H.E. Pennypacker


    Metric Tensor wrote: »
    Replacing them will help a little with solar gain but I doubt enough to make it worthwhile.

    A brise soleil of some sort would probably be more helpful. Could you install some sort of timber awning / or roof structure outside the window that will shade the window from the high summer sun but not block the low winter sun.

    Something like:

    http://hoohead.com/wp-content/uploads/2017/11/Pare-Soleil-Baie-Vitrée-Galerie-Avec-Brise-Soleil-Menuiseries-Images.jpg


    Thanks - something like that is definitely worth looking in to


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