No. Double glazing describes the glass, two panes separated by a sealed gap, while PVCu describes the frame material. A double glazed window can have a PVCu, timber or aluminium frame, and a PVCu 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 PVCu 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 PVCu windows. Phoenix Windows makes its PVCu windows in-house in Nuneaton and backs them with an insurance-backed 10-year guarantee through Assure.
Can PVCu 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? We make our own windows and fit them across Nuneaton, Bedworth, Hinckley, Tamworth and Rugby, with an insurance-backed 10-year guarantee. Call 02476 350 330, or request a quote.