Ventanas Fraktal

Sliding and folding windows

Sliding and folding windows — the ideal solution for panoramic glazing and space saving. Sashes move along the frame without taking up space when opened.

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Sliding and folding windows

REHAU Sliding Systems

UW- value 1.5
Rehau High-Design Slide

Rehau High-Design Slide

Elegant sliding system for balconies, loggias and terraces. Space-saving PVC profiles with smooth gliding operation and warmer than aluminum.
Energy rating
B
System type
Sliding
Track options
2/3/4 tracks
Sealing
Brush seals
Glass unit
up to 24mm
Surface
HDF finish
Thermal protection
Uw ≤ 1.5 W/(m²·K)
UW- value 1.0
Rehau Synego Slide

Rehau Synego Slide

Sealed sliding system with press-to-close mechanism. Silence and ease in one motion.
Energy rating
A+
System type
Sealed sliding
Profile depth
80mm
Profile chambers
7 chambers
Glass unit
up to 51mm
Max panel weight
200kg
Thermal protection
Uw ≤ 1.0 W/(m²·K)
UW- value 1.3
Rehau Panorama Swing

Rehau Panorama Swing

A unique system where panels slide and pivot, fully opening the aperture.
Energy rating
A
System type
Slide-and-turn
Panel movement
Independent
Opening
Up to 100%
Panels
3-7 panels
Glass unit
up to 40mm
Thermal protection
Uw ≤ 1.3 W/(m²·K)
UW- value 0.80
Rehau Geneo HST

Rehau Geneo HST

Premium lift-and-slide portal made from RAU-FIPRO fiberglass for giant openings up to 13m². Passivhaus certified with exceptional thermal insulation.
Energy rating
A++
System type
Lift & Slide HST
Profile depth
86mm
Material
RAU-FIPRO X
Glass unit
up to 53mm
Max panel weight
400kg
Thermal protection
Uw ≤ 0.80 W/(m²·K)

VEKA Sliding Systems

UW- value 0.83
Veka Vekamove 76

Veka Vekamove 76

Innovative sliding system. Combines the air-tightness of a classic window with the convenience and panoramic view of sliding doors.
Energy Efficiency
A
System Type
VekaMove (Smart)
Material
PVC Class A
Frame Depth
150 mm
Max. Glazing
up to 48 mm
Thermal Protection (Uw)
≤ 0.83 W/(m²·K)
Sound Insulation
≈ 43 dB
UW- value 0.78
Veka Vekamotion 82

Veka Vekamotion 82

Flagship HS system. Lift-and-slide portal for boundless panoramic glazing. Maximum light and barrier-free environment.
Energy Efficiency
A++
System Type
HS-Portal (Lift)
Material
PVC Class A
Frame Depth
194 mm
Max. Glazing
up to 54 mm
Thermal Protection (Uw)
≤ 0.78 W/(m²·K)
Sound Insulation
≈ 44 dB
UW- value 0.73
Veka Vekamotion 82 MAX

Veka Vekamotion 82 MAX

Designer version of the flagship portal. Hidden frame, maximum glass area, and the effect of boundless space.
Energy Efficiency
A++ (Max)
System Type
HS-Portal MAX
Material
PVC Class A
Frame Depth
194 mm
Max. Glazing
up to 54 mm
Thermal Protection (Uw)
≤ 0.73 W/(m²·K)
Sound Insulation
≈ 45 dB

WDS Sliding Systems

UW- value 1.6
WDS SL 60

WDS SL60

Space savings. Sliding PVC system that's warmer and quieter than old aluminum.
Energy rating
B
System type
Classic (Sliding)
Profile depth
60 mm
Chambers
3 chambers
Glass unit
up to 18 mm
Thermal protection
Uw ≤ 1.6 W/(m²·K)
Sound insulation
≈30 dB
UW- value 1.3
WDS SL 76

WDS SL76

Slider-window hybrid. 100% airtightness thanks to smart sash pressing around the entire perimeter.
Energy rating
A
System type
Airtight (Smart)
Profile depth
76 mm
Chambers
5 chambers
Glass unit
up to 48 mm
Thermal protection
Uw ≤ 1.3 W/(m²·K)
Sound insulation
≈45 dB

Kömmerling Sliding Systems

UW- value ≤ 1.3
Kömmerling PremiLine

Kömmerling PremiLine

A classic sliding system that has become the gold standard for Spanish apartments. An ideal solution for glazing balcony and loggia exits, where the priority is space-saving and mechanism reliability for daily use.
Energy efficiency
B
Material
PVC (Greenline)
Profile depth
80 mm (frame)
Insulation
3 chambers / 2 seals
Glazing unit
up to 28 mm
Thermal protection (Uw)
≤ 1.4 W/(m²·K)
Sound insulation
≈ 34 Rw(dB)
UW- value ≤ 0.95
Kömmerling PremiSlide 76

Kömmerling PremiSlide 76

A next-generation sealed sliding system combining the convenience of a slider with the tight closure of a casement window. Ideal for panoramic terraces where silence and protection from extreme weather conditions are required.
Energy efficiency
A+
Material
PVC (Xtrem)
Profile depth
76 mm (frame 158 mm)
Insulation
5 chambers / 3 seals
Glazing unit
up to 50 mm
Thermal protection (Uw)
≤ 1.1 W/(m²·K)
Sound insulation
≈ 45 Rw(dB)
UW- value ≤ 0.9
Kömmerling PremiDoor 76

Kömmerling PremiDoor 76

A classic lift-and-slide system (HST) designed for glazing medium and large panoramic openings. Combines exceptional ease of operation with high thermal insulation performance for modern housing.
Energy efficiency
A+
Material
PVC (Premium)
Profile depth
76 mm (frame 179 mm)
Insulation
5 chambers / 2 seals
Glazing unit
up to 50 mm
Thermal protection (Uw)
≤ 0.9 W/(m²·K)
Sound insulation
≈ 44 Rw(dB)
UW- value ≤ 0.9
Kömmerling PremiDoor 76

Kömmerling PremiDoor 88

Flagship ultra-premium class lift-and-slide system, certified for passive houses. Provides the highest possible level of thermal and sound insulation for giant panoramic glazing.
Energy efficiency
A++
Material
PVC (Ultra-Premium)
Profile depth
88 mm (frame 207 mm)
Insulation
7 chambers / 3 seals
Glazing unit
up to 56 mm
Thermal protection (Uw)
≤ 0.75 W/(m²·K)
Sound insulation
≈ 48 Rw(dB)

Schüco Sliding Systems

UW- value 1.1
Schüco LivIngSlide

Schüco LivIngSlide

A new dimension of comfort. Premium lift-and-slide PVC system based on Schüco LivIng 82 technology with weldable EPDM gaskets for superior airtightness.
Energy Efficiency
A++
System Type
Lift-and-slide (HS)
Material
PVC (Schüco LivIng)
Frame Depth
194mm
Max. Glazing
up to 52mm
Thermal Protection (Uw)
≤ 0.80 W/(m²·K)
Sound Insulation
≈ 45 dB
UW- value 1,1
Schüco ASE 60

Schüco ASE 60

A new standard of comfort. Modular aluminum sliding system with 60 mm sash depth, concealed hardware, and SmartClose soft-close technology.
Energy Efficiency
A
System Type
Lift-and-slide (ASE)
Material
Aluminium
Frame Depth
140mm
Max. Glazing
up to 40mm
Thermal Protection (Uw)
≤ 1.1 W/(m²·K)
Sound Insulation
≈ 41 dB
UW- value 0,80
Schüco ASE 80.HI

Schüco ASE 80.HI

Passive house aesthetics. Highly insulated sliding system with 80 mm sash depth for maximum energy efficiency.
Energy Efficiency
A++
System Type
Sliding (ASE)
Material
Aluminium HI
Frame Depth
180mm
Max. Glazing
up to 60mm
Thermal Protection (Uw)
≤ 0.80 W/(m²·K)
Sound Insulation
≈ 43 dB
UW- value 1,0
Schüco ASE 67 PD

Schüco ASE 67 PD

Absolute transparency. Panoramic aluminum sliding system (PD) with concealed frame, floor-level threshold and minimal 31mm sash meeting point.
Energy Efficiency
A+
System Type
Panoramic (PD)
Material
Aluminium PD
Frame Depth
180mm
Max. Glazing
up to 49mm
Thermal Protection (Uw)
≤ 1.0 W/(m²·K)
Sound Insulation
≈ 46 dB

Cortizo Sliding Systems

UW- value ≤ 1.6
Cortizo COR 4200

Cortizo COR 4200

Legendary sliding system with concealed wall pocket installation option (Galandage). The perfect balance between space saving, modern design, and functionality.
Energy Efficiency
B / A
System Type
Sliding (Galandage)
Material
Aluminium RPT
Frame Depth
60 / 115 mm
Max. Glazing
up to 26 mm
Thermal Protection (Uw)
≤ 1.6 W/(m2K)
Sound Insulation
≈ 38 dB
UW- value ≤ 1.3
Cortizo 4900 Corredera

Cortizo 4900 Corredera

The benchmark for modern sliding systems (Hi-Tech). Increased installation depth of 70 mm, improved thermal insulation, and strict straight-line design for balcony and terrace glazing.
Energy Efficiency
A / A+
System Type
Sliding (Hi-Tech)
Material
Aluminium RPT
Frame Depth
70 mm
Max. Glazing
up to 36 mm
Thermal Protection (Uw)
≤ 1.3 W/(m2K)
Sound Insulation
≈ 40 dB
UW- value ≤ 1.3
Cortizo C 70

Cortizo C 70

Warm PVC sliding system. The ideal solution for glazing balconies and loggias, combining space savings with the high thermal insulation of a 70 mm deep plastic profile.
Energy efficiency
A / A+
System type
Sliding (PVC)
Material
PVC (Greenline)
Frame depth
70 mm
Max. glazing
up to 28 mm
Thermal protection (Uw)
≤ 1.3 W/(m2·K)
Sound insulation
≈ 34 dB
UW- value ≤ 1.0
Cortizo E 170

Cortizo E 170

Premium PVC lift-and-slide system (HS-Portal). 170 mm installation depth for creating giant panoramic doors with effortless and smooth operation.
Energy efficiency
A++
System type
Lift-and-slide (HS)
Material
PVC (5 chambers)
Frame depth
170 mm
Max. glazing
up to 40 mm
Thermal protection (Uw)
≤ 0.9 W/(m2K)
Sound insulation
≈ 42 dB
UW- value ≤ 1.3
Cortizo COR Vision

Cortizo COR Vision

An icon of minimalism. A premium sliding system with a record-narrow interlock of just 20 mm. Creates the effect of a solid glass wall, erasing the boundaries between interior and landscape.
Energy efficiency
A+
System type
Minimalist (Vision)
Material
Aluminium RPT
Frame depth
116 mm
Max. glazing
up to 30 mm
Thermal protection (Uw)
≤ 1.3 W/(m2K)
Sound insulation
≈ 41 dB
UW- value ≤ 0.9
Cortizo COR Vision PLUS

Cortizo COR Vision PLUS

The ultimate in glazing capabilities. A minimalist system for creating giant sliding walls up to 4 meters high with the option to install triple-glazed units.
Energy efficiency
A++
System type
Minimalist (Plus)
Material
Aluminium RPT
Frame depth
180 mm
Max. glazing
up to 54 mm
Thermal protection (Uw)
≤ 0.9 W/(m2K)
Sound insulation
≈ 43 dB
UW- value ≤ 1.1
Cortizo Bi-Fold

Cortizo Bi-Fold

Bi-fold door system for complete opening of the space. Allows folding the entire glass wall into a compact stack on the side, seamlessly merging the living room and terrace into one unified area without partitions.
Energy efficiency
A+
System type
Folding (Bi-Fold)
Material
Aluminium RPT
Frame depth
73 mm
Max. glazing
up to 45 mm
Thermal protection (Uw)
≤ 1.1 W/(m²·K)
Sound insulation
≈ 45 dB

Advantages of Sliding Windows

Why customers choose sliding systems for their homes

  • Space saving — sash doesn't swing inward, furniture can be placed right up to the window.
  • Wide aperture — maximum light and air access, panoramic views.
  • Easy to use — smooth sliding even for large sashes.
  • Excellent thermal insulation — modern HST and PSK systems ensure airtightness.
  • Security — multi-point locks and anti-burglar hardware.

Types of Sliding Systems

Choose the optimal system for your home

Will a house with sliding windows be warm in winter?

Absolutely. We use modern systems with multi-contour seals. For residential spaces, we recommend the "warm" Kömmerling or Rehau series, as well as Schüco aluminum systems with thermal breaks. They offer the same airtightness and thermal insulation as standard solid walls, eliminating drafts and freezing.

Which material is better: plastic (PVC) or aluminum?

Depends on the size of the opening. Veka, Rehau, or WDS (PVC) profiles are ideal for warm loggias and standard terrace access doors—they offer the best balance of price and heat.' If you need floor-to-ceiling panoramic glazing over 3 meters wide, we recommend rigid aluminum systems from Cortizo or Schüco, which can support heavy double-glazed windows.

What are PSK and HS portals and what's the difference?

These are opening types. The PSK (parallel sliding) system first tilts and then slides to the side—an excellent choice for apartments and small openings based on Kömmerling or WDS profiles. The HS (lift and slide) system is a premium system (often Cortizo/Schüco): the sash lifts and slides almost silently. Ideal for huge openings without thresholds.

How reliable is the sliding mechanism with frequent use?

Sliding systems are designed for tens of thousands of opening cycles. Our windows use reinforced hardware designed specifically for heavy sashes. Even a massive door weighing 200–300 kg (typical of Schüco or Veka) opens with a light movement of the hand, does not sag, and lasts for years.

Are such large windows safe? Are they difficult to break?

We put safety first. Our portals use tempered glass or laminated glass, which is extremely difficult to break. Furthermore, profiles from Rehau, Cortizo, and other brands are equipped with burglar-resistant fittings with mushroom-shaped pins, making unauthorized entry virtually impossible.

Do sliding windows really save space?

Yes, this is their main ergonomic advantage. Unlike hinged doors, which require room to swing (opening radius), sliding doors move within the frame. This allows you to place furniture right up against the window and maximize the usable space of the room.

Where Sliding Windows Are Used

  • Terrace or balcony exit — wide passage without threshold.
  • Panoramic glazing — maximum light in the living room.
  • Winter gardens — connecting home with nature.
  • Verandas and gazebos — wind protection while preserving the view.

FAQ

Frequently Asked Questions About Sliding Windows

Are sliding windows warm?

Yes, modern PSK and HST systems made of PVC provide excellent thermal insulation thanks to multi-chamber profile and quality seals. They are suitable for year-round use.

What is the maximum size of a sliding window?

Lift-and-slide HST systems allow apertures up to 6 meters wide and up to 2.7 meters high. Sash weight can reach 400 kg.

Can a mosquito screen be installed?

Yes, special sliding mosquito screens are installed for sliding windows, which move along a separate track.

How secure are sliding windows?

Sliding systems are equipped with multi-point locks and can be fitted with RC2 class anti-burglar hardware. Tempered and laminated glass units are also available.

Need Help Choosing?

Order a free consultation from our company specialists. We will call you back at a convenient time and discuss how we can help you.
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All prices are in euros and include VAT and delivery costs. Crossed-out prices correspond to the original product prices according to the manufacturer's recommended retail price (if available). In case of prepayment, prices and offers will be valid for 7 days from order confirmation; subsequently, they will be subject to change. Delivery zone: Spain.

Colors, glazing, and sizes may differ from images. Image realism is not guaranteed.

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1 Production times may be increased under certain circumstances (e.g., special design, company holiday periods, etc.). For technical reasons, we cannot account for these extensions when calculating production times. Due to external circumstances in the procurement of raw materials such as steel, PVC, and wood, the production time of your order may be increased. Please keep this in mind. This does not give you the right to demand changes in contractual prices or the possibility of terminating the sales contract.

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