Composite windows
Composite windows represent the most advanced category of windows today. They combine the premium appearance of aluminum windows with excellent heat-insulating properties and maintenance-free modern materials. The result is a solution that offers high performance, high-end aesthetics and a very favorable price/performance ratio. SULKO is one of the technology leaders in the field of composite windows. Thanks to state-of-the-art manufacturing processes, we are able to offer a unique design with zero weld and clean design. If you are looking for a no-compromise solution and want to invest in the future of your home, composite windows are the logical first choice.

ARTEVO composite window
- Composite RAU-FIPRO X
- Construction depth 80 mm
- Sound insulation up to 48 dB
- Low-E variant for passive houses
- Elements up to 2.8 m in height
- Design with aluminum appearance


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Composite windows represent the most advanced category of windows today. They combine the high strength of modern composite materials with excellent heat-insulating properties and elegant design. As a result, they offer a solution that is ideal for modern family homes, architecturally demanding projects and energy-efficient buildings.
Unlike classic plastic windows, composite profiles allow you to create slimmer frames and larger glazed areas. The interior thus receives more natural light and the windows give a more modern and architecturally clean impression.
At SULKO we use the most advanced composite technology REHAU ARTEVO, which is one of the most advanced window systems of the moment. This profile system uses a high strength composite material, thanks to which windows can offer exceptional stability even at large sizes.
REHAU ARTEVO Technology
SULKO composite windows are based on an innovative system REHAU ARTEVOthat takes the possibilities of window constructions to a new level.
The ARTEVO profile system combines modern composite materials with advanced profile construction. Thanks to this, windows can offer:
- exceptional strength and stability of the structure
- very slim profiles with a larger area of glass
- superior heat-insulating properties
- high energy efficiency
- long service life without heavy maintenance
The composite material used in the ARTEVO system makes it possible to achieve high strength while maintaining low weight. This opens up new possibilities in the design of large window areas and modern glazed facades.
The invisible joint — the detail that makes the difference
The great advantage of composite windows SULKO is the technology invisible connection, sometimes also referred to as zero discord.
In conventional plastic windows, plastic welds formed when joining profiles are usually visible in the corners of the frame. Invisible joint technology removes this detail.
The corners of the windows are perfectly clean and without visible welds thanks to special manufacturing processes. Thus, the windows acquire a significantly more elegant appearance, and their design is closer to aluminum systems.
The result is:
- clean and modern window design
- perfectly smooth corners of the frames
- aesthetics suitable even for demanding architecture
Invisible joint technology (sometimes referred to as zero weld) is one of the details that significantly distinguishes modern composite windows from conventional plastic windows.
More light and modern architecture
Due to the high strength of composite profiles, composite windows allow you to create larger glazed areas than classic plastic windows.
Slimmer frames mean:
- more daylight in the interior
- more modern look of the house
- better interconnection of interior with exterior
This feature is very important especially in contemporary architecture, where large glazed areas play an essential role.
Composite windows are therefore often used in modern single-family homes, passive structures or architecturally distinctive projects.
Composite windows for energy-efficient homes
Composite windows also stand out for their heat-insulating properties. Thanks to the modern design of profiles and high-quality glazing, they are able to significantly reduce the heat loss of the house.
In combination with triple glazing, composite windows can meet even very strict requirements for the energy efficiency of buildings.
This means:
- lower heating costs
- stable indoor temperature in the interior
- increased comfort of living
Composite windows are an ideal solution for both low energy and passive houses.
Tailor-made composite windows
As with other products, we design SULKO composite windows always tailored to a specific project.
When designing, we take into account:
- architecture of the house
- size and orientation of window openings
- energy efficiency requirements
- design and color
Composite windows can be produced in a wide range of colors and finishes, so they naturally adapt to the style of both modern and traditional buildings.
Premium solution without compromise
SULKO composite windows are a premium solution for customers looking for maximum performance, modern design and durability.
Connections of technology REHAU ARTEVO, composite materials and manufacturing with technology an invisible joint (sometimes referred to as a zero joint) It offers windows that meet the most demanding requirements of contemporary architecture.
Composite windows represent an investment in the future of housing — a solution that combines technological sophistication, aesthetics and energy efficiency.



