# Cortizo COR 70 HS Aluminium Tilt & Turn Windows

> Source: https://arkaywindows.com/cortizo-cor-70-hs-aluminium-tilt-turn-windows/
> Author: Lukasz
> Published: 2026-07-21T15:41:21+00:00
> Modified: 2026-07-27T14:20:48+00:00

Discover Cortizo COR 70 HS hidden sash aluminium windows with slim sightlines, concealed handles and outstanding thermal performance from Arkay Windows.

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# Cortizo COR 70 HS Aluminium Tilt & Turn Windows


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### Hidden Sash Aluminium Windows with an Integrated Concealed Handle


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# Cortizo COR 70 HS Aluminium Tilt & Turn Windows


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### Hidden Sash Aluminium Windows with an Integrated Concealed Handle


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Suitable for luxury homes, apartment developments and commercial buildings, the COR 70 HS delivers excellent thermal performance, weather resistance and everyday practicality without compromising aesthetics.[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][vc_column column_padding="no-extra-padding" column_padding_tablet="inherit" column_padding_phone="no-extra-padding" column_padding_position="all" column_element_direction_desktop="default" column_element_spacing="0px" desktop_text_alignment="default" tablet_text_alignment="default" phone_text_alignment="default" sticky_content="true" sticky_content_functionality="css" sticky_content_alignment="default" background_color_opacity="1" background_hover_color_opacity="1" column_backdrop_filter="none" column_shadow="none" column_border_radius="none" column_link_target="_self" column_position="default" advanced_gradient_angle="0" gradient_direction="left_to_right" overlay_strength="0.3" width="1/3" tablet_width_inherit="default" 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column_margin="default" column_direction="default" column_direction_tablet="default" column_direction_phone="default" bottom_padding="4%" text_align="left" row_position="default" row_position_tablet="inherit" row_position_phone="inherit" overflow="visible" pointer_events="all" css=".vc_custom_1758802052817{margin-bottom: 10px !important;}"][vc_column_inner column_padding="no-extra-padding" column_padding_tablet="inherit" column_padding_phone="inherit" column_padding_position="all" column_element_direction_desktop="default" column_element_spacing="default" desktop_text_alignment="default" tablet_text_alignment="default" phone_text_alignment="default" background_color_opacity="1" background_hover_color_opacity="1" column_backdrop_filter="none" column_shadow="none" column_border_radius="none" column_link_target="_self" overflow="visible" gradient_direction="left_to_right" overlay_strength="0.3" width="1/12" tablet_width_inherit="default" animation_type="default" bg_image_animation="none" border_type="simple" column_border_width="none" column_border_style="solid" offset="vc_col-lg-offset-0 vc_col-md-offset-0 vc_hidden-sm vc_hidden-xs"][/vc_column_inner][vc_column_inner column_padding="no-extra-padding" column_padding_tablet="inherit" column_padding_phone="inherit" column_padding_position="all" column_element_direction_desktop="default" column_element_spacing="default" desktop_text_alignment="default" tablet_text_alignment="default" phone_text_alignment="default" background_color_opacity="1" background_hover_color_opacity="1" column_backdrop_filter="none" column_shadow="none" column_border_radius="none" column_link_target="_self" overflow="visible" gradient_direction="left_to_right" overlay_strength="0.3" width="11/12" tablet_width_inherit="default" animation_type="default" bg_image_animation="none" border_type="simple" column_border_width="none" column_border_style="solid" offset="vc_col-xs-12"][split_line_heading animation_type="line-reveal-by-space" font_style="h2" text_color="#000000" line_reveal_by_space_text_effect="default" content_alignment="default" mobile_content_alignment="inherit" link_target="_self" text_content="Hidden Sash Design with Concealed Handle" text_direction="default"][/split_line_heading][divider line_type="No Line" custom_height="30px"][vc_column_text css="" text_direction="default"]The defining feature of the COR 70 HS is its hidden sash construction. By concealing the opening sash behind the outer frame, the window creates a consistent external appearance across fixed and opening lights while allowing larger glazed areas and slimmer visible sightlines.

Internally, the integrated concealed handle sits neatly within the frame, maintaining the clean appearance of the window without projecting hardware.

Together these features provide:

 	- Hidden sash appearance

 	- Larger glazed areas

 	- Slim architectural sightlines

 	- Concealed integrated handle

 	- Minimalist internal and external aesthetics



[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row type="full_width_background" full_screen_row_position="middle" column_margin="none" equal_height="yes" content_placement="middle" column_direction="default" column_direction_tablet="default" column_direction_phone="default" scene_position="center" top_padding="3%" bottom_padding="6%" text_color="dark" text_align="left" row_border_radius="none" row_border_radius_applies="bg" overflow="visible" overlay_strength="0.3" gradient_direction="left_to_right" shape_divider_position="bottom" bg_image_animation="none" shape_type="" gradient_type="default"][vc_column column_padding="padding-12-percent" column_padding_tablet="inherit" column_padding_phone="inherit" column_padding_position="all" column_element_direction_desktop="default" column_element_spacing="default" desktop_text_alignment="default" tablet_text_alignment="default" phone_text_alignment="default" background_color="#f9d849" background_color_opacity="1" background_hover_color_opacity="1" column_backdrop_filter="none" column_shadow="none" column_border_radius="none" column_link_target="_self" column_position="default" gradient_direction="left_to_right" overlay_strength="0.3" width="7/12" tablet_width_inherit="default" animation_type="default" bg_image_animation="none" border_type="simple" column_border_width="none" column_border_style="solid" column_padding_type="default" gradient_type="default"][vc_row_inner column_margin="none" column_direction="default" column_direction_tablet="default" column_direction_phone="default" bottom_padding="6%" text_align="left" row_position="default" row_position_tablet="inherit" row_position_phone="inherit" overflow="visible" pointer_events="all"][vc_column_inner column_padding="no-extra-padding" column_padding_tablet="inherit" column_padding_phone="inherit" column_padding_position="all" column_element_direction_desktop="default" column_element_spacing="default" desktop_text_alignment="default" tablet_text_alignment="default" phone_text_alignment="default" background_color_opacity="1" background_hover_color_opacity="1" column_backdrop_filter="none" column_shadow="none" column_border_radius="none" column_link_target="_self" overflow="visible" gradient_direction="left_to_right" overlay_strength="0.3" width="1/1" tablet_width_inherit="default" animation_type="default" bg_image_animation="none" border_type="simple" column_border_width="none" column_border_style="solid" offset="vc_col-lg-11 vc_col-md-11 vc_col-xs-12"][split_line_heading animation_type="line-reveal-by-space" font_style="h2" text_color="#000000" line_reveal_by_space_text_effect="default" content_alignment="default" mobile_content_alignment="inherit" link_target="_self" text_content="Practical Tilt & Turn Functionality" text_direction="default"][/split_line_heading][vc_column_text css="" text_direction="default"]Behind its minimalist appearance, the COR 70 HS provides all the practical advantages of a modern tilt & turn window.

The tilt position allows secure background ventilation, while the turn function opens fully inwards for safe cleaning, simple maintenance and maximum airflow. 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Specification
COR 70 HS Hidden Sash





Frame Depth
70mm



System Design
Hidden Sash



Handle
Integrated Concealed Handle



Visible Sightlines
70mm Frame / 70mm Sash



Thermal Performance
Uw from **0.85 W/m²K***



Glazing Thickness
26mm – 40mm



Acoustic Performance
Up to **Rw 46dB**



Maximum Sash Size
Up to 1300mm (W) × 2400mm (H)**



Maximum Sash Weight
160kg



Air Permeability
Class 4



Water Tightness
Class E1650



Wind Resistance
Class C5



Security
PAS24 Certified



Thermal Break
35mm Polyamide



Finishes
Single & Dual Colour RAL, Textured, Metallic, Woodgrain & Anodised








* Performance depends on glazing specification, window size and configuration.


** Larger sizes are available on selected configurations using HD hinges.





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# FAQ


[/nectar_responsive_text][divider line_type="No Line" custom_height="33px"][toggles style="minimal" accordion="true" accordion_starting_functionality="closed"][toggle color="Extra-Color-3" heading_tag="h4" heading_tag_functionality="default" title="What is a hidden aluminium window?"][nectar_responsive_text inherited_font_style="default" font_size_min="14px" font_size_max="20px" font_size_desktop="1.1vw" font_line_height="1.6" text_direction="default"]
A hidden window conceals the opening vent behind the outer frame, creating the appearance of fixed glazing while increasing the visible glass area and producing cleaner external elevations.


[/nectar_responsive_text][/toggle][toggle color="Extra-Color-3" heading_tag="h4" heading_tag_functionality="default" title="What are the benefits of tilt & turn windows?"][nectar_responsive_text inherited_font_style="default" font_size_min="14px" font_size_max="20px" font_size_desktop="1.1vw" font_line_height="1.6" text_direction="default"]
Tilt & turn windows provide secure everyday ventilation through the tilt position while opening fully inwards for easy cleaning, maintenance and maximum airflow.


[/nectar_responsive_text][/toggle][toggle color="Extra-Color-3" heading_tag="h4" heading_tag_functionality="default" title="Are Cortizo COR 70 HS windows energy efficient?"][vc_column_text css="" text_direction="default"]
Yes. The system incorporates a polyamide thermal break and supports both double and triple glazing, achieving window U-values from 0.8 W/m²K.


[/vc_column_text][/toggle][toggle color="Extra-Color-3" heading_tag="h4" heading_tag_functionality="default" title="Can the COR 70 HS be specified for commercial projects?"][nectar_responsive_text inherited_font_style="default" font_size_min="14px" font_size_max="20px" font_size_desktop="1.1vw" font_line_height="1.6" text_direction="default"]
Yes. The system is suitable for residential developments, apartment buildings and commercial applications where slim sightlines, thermal performance and weather resistance are required.


[/nectar_responsive_text][/toggle][toggle color="Extra-Color-3" heading_tag="h4" heading_tag_functionality="default" title="What finish options are available?"][nectar_responsive_text inherited_font_style="default" font_size_min="14px" font_size_max="20px" font_size_desktop="1.1vw" font_line_height="1.6" text_direction="default"]
The COR 70 HS is available in a wide range of single and dual colour powder-coated finishes, including the full RAL colour range.


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