Bengaluru is an easy climate for windows compared with the coast — no salt air, moderate temperatures — but the monsoon brings driving rain against west and south faces, and the dry months bring fine construction dust. Both uPVC and aluminium work here. The choice comes down to span, aesthetics, and who is fabricating.
Where uPVC wins
uPVC sashes carry good gaskets in a multi-chambered profile, so a well-made casement or tilt-and-turn seals tightly against wind-driven rain and street noise. The profile does not conduct heat, which matters on a glazed west elevation. It needs no painting. The limits are span and slenderness: large sliding or fixed panels need steel reinforcement inside the chamber, and the sightlines are heavier than aluminium.
Specify uPVC for residential casement and tilt-and-turn windows, bedrooms facing traffic, and anywhere the client wants a sealed, low-maintenance window and is not chasing minimal frames.
Where aluminium wins
Aluminium takes large sliding panels, slim fixed glazing and tall doors that uPVC cannot without heavy reinforcement. Powder-coated or anodised finishes last for decades. Thermal-break profiles close most of the insulation gap. Fabrication is faster for a shop already tooled for aluminium.
Specify aluminium for large sliders, shopfronts, balcony glazing, slim-sightline picture windows and any commercial job.
What the hardware has to do either way
- Friction stays sized to the sash weight, not just its height — double-glazed sashes are heavier than they look.
- Multi-point locking on anything above about 1.2 m tall or exposed, so the sash pulls in evenly against the gasket.
- Weatherseals in EPDM, not cheap PVC, on the rain-facing elevations.
- Restrictors or egress hinges on upper-floor openable windows.
Send us the elevation, the glass make-up and the face it sits on, and we will list the stays, locks and seals that suit — in either system.
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