Cortizo Windows
COR 70 Hidden Sash
A 70 mm concealed-sash window with hidden and half-hidden visual options.
- 70 mm frame and sash
- 66 mm visible sightline
- Hidden and half-hidden solutions
Product details
Keep the opening sash discreet.
View full size COR 70 Hidden Sash creates a consistent exterior frame line while retaining a choice of opening functions. The hidden-sash version uses a 70 mm frame and sash. A separate half-hidden solution is also published, with different sash depth, glazing capacity and size limits.
Side-hung, tilt-and-turn, bottom-hung and parallel-opening choices help adapt the window to its room. Glass thickness, hardware and any heavy-duty sash must be considered as one specification.
Colour & surface
Cortizo anodised finishes
Explore Cortizo’s 20-sample anodised colour chart. The wider collection combines 13 colours with surface treatments to create over 110 finishes.
Explore all 20 anodised samples
Confirm the reference, surface treatment, anodising class and availability for the selected system with a physical sample before ordering. Screen colours are indicative; handles, panels and inside/outside combinations are specified separately. Powder-coated examples include RAL 9016 White, RAL 7016 Anthracite Grey and RAL 9005 Jet Black. Metallic silver and selected wood-effect finishes can also be discussed.
Open a sample to explore the surface and save a preference for your enquiry.
Inside the construction
Look a little closer.
Open the drawings to inspect frame, glass and fixing details.
Hidden-sash frame section
The 70 mm hidden-sash arrangement. The separate half-hidden solution has different profile and glazing dimensions.
Open full-size Specification
At a glance.
- Hidden frame / sash depth
- 70 / 70 mm
- Hidden-sash glazing
- 26–40 mm
- Standard hidden-sash maximum
- 1300 × 2400 mm
- Hidden-sash thermal headline
- Uw from 0.85 W/m²K for selected hidden-sash configurations
- Half-hidden alternative
- 70 / 78 mm frame / sash; 6–55 mm glazing; published maximum 1000 × 1700 mm, subject to configuration
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A versatile 70 mm aluminium platform for fixed lights and a wide choice of opening windows.
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COR 80 Hidden Sash
A concealed opening sash for consistent exterior sightlines in an 80 mm window platform.
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Cortizo Casement
Outward-opening aluminium casements designed around familiar UK window arrangements.
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Choose the opening function.
Tell us how each window needs to ventilate or open, and send approximate dimensions. An elevation and any proposed glass build-up will help us review the hidden-sash configuration.
Discuss COR 70 Hidden Sash