Comparing the frames themselves — uPVC versus aluminium? Here's what actually differs.
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.
uPVC frames are multi-chambered, trapping air to insulate naturally; aluminium conducts heat readily and needs a thermal break to match. Aluminium is stronger, allowing slimmer sections.
Aluminium, inherently — which is why it can be slimmer. uPVC compensates with steel reinforcement where needed.
uPVC's natural insulation suits the heat, and it won't corrode. Aluminium suits where slim sightlines matter most.
Related guides covering this topic from other angles — different products, applications, or contexts.
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