Thermally broken uPVC window frames

[Kat Achterberg]

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)?

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[alexking]

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”?

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[Kat Achterberg]

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.

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[Jonny Parker]

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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