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COR 80 Hidden Sash window with an autumn garden view

Cortizo Windows

COR 80 Hidden Sash

A concealed opening sash for consistent exterior sightlines in an 80 mm window platform.

  • Concealed exterior opening sash
  • 66 mm visible sightline
  • Concealed hinge and handle options
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Product details

A concealed sash. A consistent elevation.

White aluminium bay windows overlooking the coastlineView full size

The opening sash sits behind the outer frame when viewed from outside, helping opening and fixed lights read as a consistent composition. COR 80 Hidden Sash suits elevations where the frame should feel quiet and the view should take precedence.

Inward opening is combined with options for concealed hinges and drainage. The optional ARCH INVISIBLE handle is a detail within the system, while standard and heavy-duty sash configurations have different limits.

Your choices

Consider the sash, glass and finish.

Standard or heavy-duty sash

Select the sash around the opening size and glass weight; heavy-duty dimensions do not apply to the standard sash.

Handles and fittings

Choose the handle style and any concealed fittings supported by the selected configuration. Explore the colour and surface samples below.

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.

Cortizo anodised finishes

Inside the construction

Look a little closer.

Open the drawings to inspect frame, glass and fixing details.

Concealed sash & glazing junction

The 80 mm profile depth and 66 mm visible frame detail, with the opening sash concealed behind the outer frame.

Concealed sash & glazing junctionOpen full-size

Specification

At a glance.

Frame / sash depth
80 / 80 mm
Glazing range
36–51 mm
Standard sash maximum
1300 × 2400 mm
Thermal headline
Uw from 0.71 W/m²K in selected configurations

Compare your options

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Your project

Coordinate the concealed sash.

Share the opening dimensions and an elevation showing fixed and opening windows. Include any glass specification so we can review the sash configuration and concealed details together.

Discuss COR 80 Hidden Sash