Comparison
uPVC or aluminium windows? A comparison on technical grounds
The real comparison is not "which is better" but "which suits which opening": thermal conductivity, acoustics, maintenance and large spans.
August 2026
Choosing between uPVC and aluminium is an engineering decision, not a matter of taste. The fundamental difference is the material: aluminium is a metal and a good conductor of heat, which is why its insulated systems rely on a thermal break between the inner and outer faces. uPVC is an insulating material to begin with, and the air chambers inside the profile add to that.
Where each one is stronger
| Item | uPVC | Aluminium |
|---|---|---|
| Thermal conductivity of the material | Insulating material with air chambers | Conductive metal — needs a thermal break |
| Very large spans | Depends on internal reinforcement and system | Metal rigidity allows slimmer sections |
| Routine maintenance | No painting required | Depends on the finish system |
| Weight | Heavier for an equivalent section | Lighter |
The documented figures in Premier's systems
Thermal performance is measured by Uw (lower is better insulation) and acoustics by Rw. Premier's strongest thermal system is the six-chamber Frankfort Casement 70: Uw 1.18 and Rw ≥ 40 dB. The SETI Casement 60 records Uw 1.30 and Rw ≥ 32 dB, with Air Class 2 to EN 12207 and Wind C4 to EN 12210.
These are Premier's own catalogue figures. Any comparison against a specific aluminium system should be made against that supplier's certified figures for the same test items.
When to choose which
- When thermal and acoustic insulation lead in a residential unit: multi-chamber uPVC casement systems are the direct route.
- For exceptional spans or special structural requirements: engineer each opening individually against its wind load.
- For large sliding openings: Premier's sliding systems reach 137 mm depth with three glass sashes for the widest opening.
The figures above come from Premier's technical catalogue. Final pricing and availability are confirmed by the Premier team against your actual sizes and quantities.
COMMON QUESTIONS
- Which lasts longer?
- Service life depends on compound and fabrication quality, installation and site environment in both materials — not on the material alone.
- Does uPVC handle the Egyptian climate?
- The systems are manufactured to documented European standards and classified on the air and wind items above. The compound and its stabiliser package are what to review with the supplier.