Is uPVC the same as double glazing?
No. Double glazing describes the glass, two panes separated by a sealed gap, while uPVC describes the frame material. A double glazed window can have a uPVC, timber or aluminium frame, and a uPVC frame can also hold single or triple glazing.
What is double glazing made of?
Two panes of glass held apart by a spacer bar, with a sealed cavity commonly around 16 to 20 mm wide. The cavity is often filled with argon, and one pane usually has a low-emissivity coating to reduce heat loss.
What does uPVC actually mean?
It stands for unplasticised polyvinyl chloride: a rigid, low-maintenance plastic extruded into hollow chambers that are usually reinforced with steel where needed.
Which matters more for keeping a home warm?
Both. Replacement windows in England must meet a maximum Uw of 1.4 W/m²K, or equivalent Window Energy Rating of Band B, covering frame, glass and spacer together. Compare the rated figure, not just the frame. See our uPVC windows. Jake at JMF Windows surveys every job himself, JMF is Certass registered, and its A-rated windows carry a 10-year guarantee.
Can uPVC frames hold triple glazing?
Yes. Many profiles accept triple glazed units for a lower U-value, but the heavier glass needs strong hardware and a deeper frame. Part L in England does not require triple glazing, so the benefit depends on the property.
Thinking about new windows? Jake surveys every job himself, and our quotes are free, in writing and without obligation. We fit across Oxford, Kidlington, Bicester, Witney, Abingdon and the villages around. Call 01865 708464 or ask for a free quote.
