UW- value ≤ 1.0
Cortizo COR 70 Hoja Oculta is the architect's choice for minimalist projects. The name "Hoja Oculta" translates as "hidden sash". In this system, the sash profile is concealed behind the frame, so when viewed from outside, you see only a thin profile edge of just 66 mm. This creates a unique visual effect: fixed and operable window sections look absolutely identical, providing perfect symmetry and clean facade lines.
But here, design works hand in hand with technology. By reducing the visible profile area, the glazing surface increases, allowing 15-20% more natural light into the room compared to standard windows. At the same time, the system retains all the advantages of the 70 mm platform with thermal break: it provides excellent thermal insulation, blocks street noise, and possesses high rigidity, enabling the creation of elegant panoramic structures.
Article number
300.200.002
Technical Specifications
Details
The aesthetics of invisibility. An innovative aluminium system with a "concealed sash": only the frame is visible from outside, making operable and fixed sections indistinguishable and increasing the glazing area.
Energy efficiency
A / A+
Material
Aluminium (Concealed)
Profile depth
70 mm
Insulation
35 mm thermal break
Glazing unit
up to 40 mm
Thermal protection (Uw)
≤ 1.0 W/(m²·K)
Sound insulation
≈ 44 Rw(dB)
System Design Parameters:
- Installation depth: 70 mm.
- System type: Concealed sash (Hoja Oculta) - the sash is visually invisible from outside.
- Visible profile width: Only 66 mm (from the street), one of the best indicators on the market.
- Thermal insulation: RPT technology with 35 mm wide glass fibre reinforced polyamide thermal bridges.
- Material: Primary processed 6063 T5 aluminium alloy.
- Sealing: Triple-seal system (external, internal and central gaskets) for maximum airtightness (Class A).
- Profile wall thickness: 1.9 mm (enhanced strength).
Glazing Options:
- Maximum glazing thickness: up to 40 mm.
- Glazing types: Double or triple glazed energy-efficient units, tempered glass.
Maximum Dimensions and Finishes:
- Maximum sash dimensions: Width up to 1300 mm, Height up to 2400 mm.
- Sash weight: up to 100 kg.
- Colour options: Any RAL colour, anodising, wood-effect sublimation, antibacterial coating. "Bicolour" option available.
Certified Performance:
- Profile thermal transmittance (Uf): from 1.7 W/m²K.
- Window thermal transmittance (Uw): up to 1.0 W/m²K (with Ug=0.6 glazing unit).
- Water tightness: Class E1200 (excellent protection against heavy rain).
- Air permeability: Class 4.
- Sound insulation: up to 44 dB.
Documentation
Technical specifications
PDF. 304Kb
Design
Seamless glazing effect
Light
Maximum natural light
Comfort
Superior thermal insulation
Cortizo COR 70 Hoja Oculta
The aesthetics of invisibility. An innovative aluminium system with a "concealed sash": only the frame is visible from outside, making operable and fixed sections indistinguishable and increasing the glazing area.
Calculate Cost
Estimated manufacturing time 3-6 weeks.
Eligible for NextGen Subsidy -80%
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Available Services
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More detailsDon't Forget to Add
Additional elements and accessories that will make your home even more comfortable
Mosquito Nets
Protect your home from insects, dust, and pollen, allowing you to enjoy fresh air even in the middle of summer.
Handles and Locking Elements
Quality hardware ensures ease of use and security for your windows and doors.
Lamination
Colorful home facades and the desire to decorate your home leads to growing demand for laminated windows every year.
Decorative Elements
Decorative strips and bars allow you to give your windows an individual style, emphasizing the architectural features of your home.
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UW- value ≤ 1.3
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Sound Insulation
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FAQs
Frequently Asked Questions about Cortizo COR 70 Hoja Oculta
What is "Hoja Oculta" and why is it needed?
Hoja Oculta means "hidden sash". In conventional windows, you see the frame and inside it another frame (the sash). Here, the sash is hidden behind the outer frame contour. This is a purely aesthetic solution that makes windows look more modern and sleek whilst increasing the glass area.
Are these windows much thinner than standard ones?
Visually, yes. The visible aluminium part is only 66 mm, whereas in standard uPVC or older aluminium windows, the frame width can reach 100-120 mm. This provides a significant increase in light, especially in smaller window openings.
Does the thermal insulation differ from standard COR 70?
The performance characteristics are very similar as they use the same base (70 mm depth and 35 mm thermal break). However, due to the concealed sash design, the maximum glazing thickness is limited (up to 40 mm compared to 55 mm for Industrial), so the choice of super-thick glazing units is somewhat more limited.
Are these windows harder to clean?
On the contrary, they are easier to clean. There is no protruding sash on the outside where dirt and dust usually accumulate. The smooth frame surface and minimal ledges make window maintenance quick and easy.
How does the concealed sash open?
From inside, the window looks like a conventional one with a visible sash and handle. It opens just like any other tilt-and-turn window. The "invisibility" effect only works when viewed from outside.
Does the concealed design affect security?
The concealed sash actually enhances burglar resistance because there is no visible gap between the sash and frame on the outside that could be pried with a tool. The system is fully compatible with anti-burglary hardware, providing reliable home protection.
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