Aluminium Casement Windows (Cortizo Casement)
Outward-opening aluminium windows with narrow sightlines, strong thermal efficiency, and PAS 24 security.
Product Overview
The Cortizo Casement window is an aluminium casement window – outward opening, with slim contemporary frames and strong thermal performance. Available in side-hung and top-hung configurations, with options for fixed panes, bays, and shaped units, it is ideal for both replacement projects and new construction.
If you’re upgrading older windows and want the low maintenance of aluminium without losing light to thick frames, it’s worth considering. It’s also PAS 24 certified, so it meets enhanced security standards out of the box.
Features
Narrow sightlines
70mm frame and sash profiles let more light into your home
Low U-values
Achieves 0.9 W/m²K with the right glazing, meeting modern efficiency standards
PAS 24 approved
Certified to UK enhanced security standards
Acoustic insulation
Reduces external noise by up to 45 dB
Customisable finishes
RAL colours, anodised, or wood-effect coatings, with dual-colour options
Slim and heavy-duty sash options
Accommodates window sizes up to 1800mm × 1800mm
Technical Details
Thermal & Acoustic
- U-value: From 0.9 W/m²K
- Thermal break: 32mm polyamide
- Acoustic insulation: Up to 45 dB
Weather & Security
- Air permeability: Class 4
- Water tightness: Class E1200
- Wind resistance: Class CE2400
- Security: PAS 24 certified
Frame & Glazing
- Frame and sash depth: 70mm
- Profile thickness: 1.6mm
- Glazing thickness: 23–44mm
Maximum Opening Sizes
- Slim sash: Up to 1200 × 1300mm (top-hung), 950 × 1300mm (side-hung)
- Heavy-duty sash: Up to 1800 × 1800mm (top-hung), 750 × 1750mm (side-hung)