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The Cor 70 Hidden Sash Tilt and Turn window from Cortizo offers a premium minimalist solution for modern residential and commercial projects. Designed to hide the sash behind the frame from the exterior, this system delivers an ultra-slim sightline that maximises natural light and complements contemporary architectural styles. Ideal for those seeking clean aesthetics without compromising on function, the Cor 70 Hidden Sash is a high-performance window engineered for flexibility and energy efficiency.
Manufactured in-house by Direct Trade Windows, these windows combine advanced thermal insulation with the versatility of tilt and turn operation—tilting for secure ventilation and turning inward for easy access. With exceptional U-values, PAS24-certified security, and a wide range of colours and finishes, the Cor 70 Hidden Sash system is an excellent choice for discerning clients who value refined design, performance, and long-term value.
Key Features:
- Hidden sash design: Ultra-slim exterior frame with modern, flush aesthetics
- Tilt and turn operation: Practical for ventilation, safety, and easy cleaning
- Thermal performance: Achieves U-values as low as 1.0 W/m²K with triple glazing
- Secure by design: PAS24 certified with multi-point locking
- Custom finishes: Available in single or dual colour RAL, anodised, and textured options
- In-house manufacturing: Precision built with technical support and quality control at every stage
Technical Specification
- Material: Aluminium alloy 6063 T5 with thermal break
- Frame Depth: 70 mm
- Sash Depth: 70 mm
- Profile Thickness: 1.9 mm
- Polyamide Strip Length: 35 mm
- Glazing Options: Double or triple glazing; up to 40 mm thickness
- Thermal Performance: Uw ≥ 1.0 W/m²K (with triple glazing)
- Acoustic Insulation: Up to Rw = 46 dB
- Air Permeability: Class 4 (EN 12207)
- Water Tightness: Class E1650 (EN 12208)
- Wind Resistance: Class C5 (EN 12210)
- Maximum Sash Dimensions: Width: 1,300 mm; Height: 2,400 mm
- Maximum Sash Weight: 160 kg
- Opening Options: Inward opening – side hung, tilt, tilt & turn
- Hardware Options: Concealed hinges, security hardware, ARCH INVISIBLE handle
- Finishes: Powder-coated (RAL colours, mottled, rough), anodised, wood effect; bicolour options available
- Gaskets: EPDM triple gasket system
- Compliance: Meets EN standards for air, water, and wind resistance; security test passed
Colours
White aluminium frame colour finish sample.
Matt white aluminium frame colour finish sample.
Matt brown aluminium frame colour finish sample.
Jet black aluminium frame colour finish sample
Grey aluminium frame colour finish sample.
Gloss white aluminium frame colour finish sample.
Gloss off white aluminium frame colour finish sample.
Dark red aluminium frame colour finish sample.
Dark grey aluminium frame colour finish sample.
Dark green aluminium frame colour finish sample.
Dark brown aluminium frame colour finish sample.
Dark blue aluminium frame colour finish sample.
Cream aluminium frame colour finish sample.
Black aluminium frame colour finish sample.
Anthracite grey aluminium frame colour finish sample.
Airforce grey aluminium frame colour finish sample.
Glass
Unglazed aluminium window frame with angled top.
Standard self-clean glass panel with clear finish.
Standard toughened glass panel with clear finish.
Clear solar control glass panel for improved comfort and energy efficiency.
Self-cleaning glass panel designed to break down dirt and reduce cleaning frequency.
Self Clean Solar Control panel combining dirt-repelling and heat-reducing technology.
Satin obscure glass panel with smooth frosted finish.
Laminated security glass panel with clear finish.
Brochure
Gallery
COR 70 Hidden Sash Tilt and Turn Windows FAQs
Why choose COR 70 Hidden Sash windows?
These windows maximise natural light with slim sightlines while offering excellent insulation and security. They are ideal for contemporary homes and commercial projects wanting sleek design with lasting performance.
What are COR 70 Hidden Sash windows?
COR 70 Hidden Sash windows are slimline aluminium windows designed with a concealed sash for a minimalist look. They combine modern style with high performance in energy efficiency, durability, and weather resistance.
Are COR 70 Hidden Sash windows energy efficient?
Yes. The system is engineered with advanced thermal breaks and high-performance glazing, helping reduce energy bills and keep interiors comfortable year-round.
Can COR 70 Hidden Sash windows be customised?
Absolutely. They are available in a wide range of colours, finishes, and opening options, including tilt & turn, sliding, and side hung designs.
Are COR 70 Hidden Sash windows secure?
Yes. The system is tested for high security standards, with strong aluminium frames and advanced locking options for peace of mind.
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