Home › Forums › General Discussion › Thermally broken uPVC window frames

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  • May 13, 2016 at 12:37 pm #2278
    Kat Achterberg
    Participant

    Hi,
    I heard somewhere that it is important to choose thermally broken uPVC window frames over non-thermally broken uPVC frames. I did not know a difference between the two existed and I can’t find anything online. Can anybody clear this up for me? Do thermally broken uPVC window frames exist (or rather, do non-thermally broken ones exist – aren’t they all thermally broken due to their nature)?

    May 14, 2016 at 1:41 pm #2279
    alexking
    Participant

    The thermally broken/non thermally broken applies to aluminum frames. I’ve never heard that in reference to uPVC. uPVC is already a reasonable insulator so doesn’t need to be “thermally broken”?

    May 16, 2016 at 9:33 am #2280
    Kat Achterberg
    Participant

    Yes, that is what I thought as well. The reasoning for having a “thermally broken” uPVC frame was that there is a steel frame encased in the uPVC which would conduct heat and thus should be thermally broken.

    May 16, 2016 at 9:39 am #2281
    Jonny Parker
    Participant

    Hi,

    Great question.

    uPVC joinery consists of a series of sealed air chambers in a lattice of uPVC. This offers a far greater thermal performance as it phases down the heat transmission using trapped compartmentalized air.

    So its a very different design to a thermal break which is normally a single layer of uPVC sandwiched between aluminum joinery. (No air to phase down heat transmission)

    Cheers

    Jonny

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