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Tilt an turn window in a childrens bedroom
tilt and turn window in front of chair with sea view

Expert functionality and chic aesthetics

At Direct Trade Windows, we use the COR 70 Hidden Sash model from Cortizo to offer tilt & turn windows that combine expert functionality with ease of operation.

With a hidden sash design to hide hardware in a chic slim frame, tilt & turn windows are a great choice for modern or traditional stylings, with our committed in-house team happy to install them in both residential and commercial spaces.

Our tilt & turn windows offer:

  • Invisible efficiency – Hidden sash maximises the glazing surface.
  • Versatile style – The optimal choice for modern and traditional applications.
  • Security – Fully PAS24 accredited.
  • Improved ventilation – The tilt allows for top ventilation, while the turn function allows effective air flow.
  • Custom finishes – Tailored to fit any space.
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Trusted manufacturers since 2000

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Cortizo COR 70 Hidden Sash

The COR 70 Hidden Sash Window from Cortizo has a sightline of just 66mm and includes the Arch Invisible handle, hidden hinges, and drainage system. Any element that disrupts the visual balance of the window is eliminated, minimising the aesthetic impact of the window mechanisms, creating a sleek, modern and artistic effect.

  • Concealed hinges, drainage and handle
  • Inward opening allowing to place the base of the frame on the site itself
  • Maximum glazing of 40mm
  • Maximum sash width of 1300mm
  • Maximum sash height of 2400mm
  • Maximum sash weight of 160kg
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Modern office building with long vertical windows
Office tilt and turn windows
tilt and turn windows on large commercial building

Smart Alitherm Heritage Tilt & Turn Windows

Smart Alitherm Heritage Tilt & Turn Windows provide the ideal solution for heritage applications such as large-scale building renovations and large-scale replica refurbishment projects where planning constraints need to be considered.

These windows are designed to be built as a series of horizontal modules which can be stacked using horizontal couples to form a multi-part window featuring a specially designed drip bar between modules.

Window Energy ‘B’ rating
U-value of 1.5 W/m²K
Document L compliant
Designed as a direct replacement for steel windows

  • Cortizo COR 70 Hidden Sash
  • Smart Alitherm Heritage Tilt & Turn Windows
  • Colours
  • Glass Options
  • Downloads
  • Cortizo COR 70 Hidden Sash

    Technical Specification

    • Glazing
      Max. 40 mm
      Min. 26 mm
    • Opening possibilities
      Inward opening
      Side hung
      Tilt & turn
      Tilt only
    • Sightlines
      Frame 70 mm
      Sash 70 mm
    • Profile thickness
      Window 1.9 mm
    • Polyamide strip length
      35 mm
    • Maximum sash dimensions

    Standard Solution
    Width (L) 1,300 mm
    Height (H) 2,400 mm

    HD Hinges (Side Hung)
    Width (L) 1,200 mm
    Height (H) 3,500 mm

    Maximum sash weight
    160 kg

    Consult maximum weight and dimensions according to typologies.

    Finishes
    Possibility of dual colour systems
    Colour powder coating (RAL, mottled and rough)
    Wood effect powder coating
    Anti-bacterial powder coating
    Anodised

    Cor 70 cross section

    Smart Alitherm Heritage Tilt & Turn Windows

    Technical Specification

    • Brand Alitherm
    • Material Aluminium Polyamide
    • Dual Colour Yes
    • Thermally Broken Yes
    • NBS Available Yes
    • WER Rating B
    • U Value 1.5W/m²K (using 1.0W/m²K glass unit)
    • Document L Compliant Yes
    • Kitemark Yes
    • BS 6375-1:2009 Yes
    • BS 4873 Yes
    • Side Hung Max Width (mm) 600
    • Side Hung Max Height (mm) 1400
    • Top Hung Max Width (mm) 1400
    • Top Hung Max Height (mm) 1400
    • Fixed Max Width (mm) 2100
    • Fixed Max Height (mm) 2100
    • Single Door Max Width (mm) 900
    • Single Door Max Height (mm) 2100
    • Glazing (mm) 24, 28, 32 & 36 double or triple glazed units
    • Frame Depth (mm) 47
    • Typical Sightlines (mm) 59
    Alitherm Heritage tilt and turn

    Colours

    Colours

    Pure White RAL-9010

    Pure White RAL-9010

    Matt White

    Matt White

    Matt Brown

    Matt Brown

    Jet Black RAL-9005

    Jet Black RAL-9005

    Grey

    Grey

    Gloss White

    Gloss White

    Gloss Off White

    Gloss Off White

    Dark Red

    Dark Red

    Dark Grey

    Dark Grey

    Dark Green

    Dark Green

    Dark Brown

    Dark Brown

    Dark Blue

    Dark Blue

    Cream

    Cream

    Black

    Black

    Anthracite Grey RAL-7016

    Anthracite Grey RAL-7016

    Airforce Grey

    Airforce Grey

    Glass Options

    Glass Options

    Unglazed

    Unglazed

    Standard Self Clean

    Standard Self Clean

    Standard Tough

    Standard Tough

    Solar Control

    Solar Control

    Self Cleaning

    Self Cleaning

    Self Clean Solar Control

    Self Clean Solar Control

    Satin Obscure

    Satin Obscure

    Laminated Security

    Laminated Security

    Downloads

    Gallery

    Tilt & Turn Windows - Your Questions Answered

    Explore common questions about our Tilt & Turn Windows, a versatile window choice that combines expert functionality with chic aesthetics. Learn how these windows offer security, ventilation, and custom finishes for both modern and traditional spaces.

    Request a Free Quote for Tilt & Turn Windows

    What are Tilt & Turn Windows, and where can they be installed?

    Tilt & Turn Windows are a versatile window design that can be installed in both residential and commercial spaces. They offer expert functionality, improved ventilation, and custom finishes.

    What sets the COR 70 Hidden Sash model from Cortizo apart?

    The COR 70 Hidden Sash Window features a hidden sash design with a slim frame, concealed hinges, drainage, and handle. It maximises glazing surface, eliminates visual disruptions, and offers a sleek, modern aesthetic.

    What are the key features of Smart Alitherm Heritage Tilt & Turn Windows?

    Smart Alitherm Heritage Tilt & Turn Windows are ideal for heritage applications, with a U-value of 1.5 W/m²K, making them energy-efficient. They are designed as a direct replacement for steel windows, meeting Document L compliance.

    Can Tilt & Turn Windows provide both security and ventilation?

    Yes, Tilt & Turn Windows are fully PAS24 accredited, ensuring security. They also offer improved ventilation, with the tilt function for top ventilation and the turn function for effective air flow.

    Can these windows be customised to fit specific spaces?

    Yes, these windows offer custom finishes and can be tailored to fit any space, making them suitable for a wide range of design preferences and requirements.

    Close up view of steel look windows

    Delighted Customers Share Their Experiences

    At Direct Trade Windows, our commitment to excellence is reflected in our exceptional customer satisfaction.
    We take great pride in our impressive 4.9 rating on Google, a testament to the unparalleled quality and service we offer.

    Check Out Our Google Reviews

    We had been severely let down by a previous supplier, but when we turned to Direct Trade Windows for help, we hit the jackpot. Helping us to transform a residential development in Hersham, they supplied us with high-quality, ultra-slim Cortizo sliding doors, complete with the bespoke sliding options that we needed. Our requirements were very specific and not readily available on the market, but Direct Trade Windows really went the extra mile to help us out, coming through with quality products and excellent service. We will definitely be using their services again.

    Park Lane Developments

    2022

    Nothing but praise for this outfit. It was a pleasure to work with them. It was a nerve-wracking undertaking for us, the biggest single expense to fit three large window/french door combos in our extension, yet the team made it a relatively relaxing experience with their professionalism and good humour. Thank you all so much for everything you and the whole team have done to get from the initial sale (well done Hash!) to the fun visit we made to the workshop, to the design and its multiple iterations (thank you Taz!) and finally to the installation. Thoroughly recommended.

    Eloise Price - 2022

    Direct Trade recently replaced a large, faulty sky light. They said they’d take 3 hours, they took two. They did a fantastic job, there was absolutely NO dust or mess, at all. I was amazed… thought I’d be clearing up dust for days! I also didn’t need to get the recess re-plastered or painted – bonus!

    I highly recommend Direct Trade. They are a professional and friendly service delivering a high quality product.

    Vicky Steele - 2022

    I met with Taz at the warehouse to see some examples of the glazing and from the beginning he was extremely professional, personable and helpful. We ordered crittal style windows and doors, a Juliet door, 3 other windows and roof lights and every one of them was excellent quality, secure and well made. I highly recommend Taz and his team at Direct Trade Windows!

    Nick Robinson - 2021

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