For tilt-and-turn windows, how do aluminium and uPVC compare? Here's an honest look.
Aluminium window frames are strong and slim, which lets them carry large panes with thin sightlines. But aluminium conducts heat readily, so an aluminium frame transmits more heat than uPVC unless it has a thermal break.
uPVC frames are multi-chambered — the hollow chambers trap air, which slows heat transfer. That makes uPVC naturally insulating without needing a thermal break.
We build in uPVC, so take this with that in mind: aluminium is genuinely good where you want very slim sightlines on a big span. For most homes here, uPVC's insulation and zero maintenance win — but we'd rather be straight than pretend aluminium has no place.
Both work — uPVC insulates naturally and needs no maintenance; aluminium gives slimmer sightlines but needs a thermal break. Tilt-and-turn hardware is available for both.
Not fundamentally — the hardware does the work. Both need reinforcement sized to the sash weight.
Both can handle it with proper reinforcement; aluminium's strength allows slimmer sections on very large sashes.
Related guides covering this topic from other angles — different products, applications, or contexts.
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