IT Twin

Two windows next to each other, 18mm frame distance, EBY middle rafter

Installation type - Object Type Description

Speed up your early design process with pre-defined VELUX installation solutions.

Use Installation Types to quickly explore daylight concepts, roof layouts, window sizes, and roof window placements without committing to detailed product specifications too early in the project.

These lightweight BIM objects are specifically developed for concept and schematic design stages. Geometry and product information are intentionally simplified, allowing you to focus on space, daylight, proportions, and overall design intent while maintaining maximum flexibility for later project development.

Switch between different roof window sizes and configurations to identify the solution that best fits your design. Once the project requirements become clearer, refine the selected Installation Type into specific VELUX roof windows with detailed performance data, operation type, glazing, finishes, blinds, shutters, and accessories.

When your project requires detailed geometry and specification-ready product information, continue the design process using CoBIM and the VELUX Revit Add-in.

Why Choose Twin?

Choose Twin when you want to combine two roof windows into one coordinated daylight solution while maintaining a dedicated structural element between the windows.

The Twin Installation Type uses a pre-engineered VELUX EBY support rafter positioned between the roof windows. The support rafter is designed to match the window frame geometry and creates a clean, consistent transition between the glazing elements without relying on site-built solutions.

Use this installation type to quickly evaluate the daylight potential, proportions, and architectural impact of a twin-window configuration during the early design stages. The coordinated system helps you visualize the complete solution from the beginning while keeping the flexibility to finalize glazing, operation type, finishes, blinds, shutters, and accessories later in the project.

Compared to a single roof window, Twin provides a significantly larger glazed area, increased daylight penetration, enhanced views to the sky, and greater natural ventilation potential.

The integrated installation package combines flashing, EBY support rafter, insulation frame, and underfelt collar into one coordinated solution, helping you achieve a durable, weather-tight, and visually consistent result.

Key Benefits

- Wider daylight opening than a single roof window
- Minimal 18 mm frame distance between windows
- Dedicated VELUX EBY support rafter between windows
- Consistent architectural appearance
- Increased natural ventilation potential
- Factory-engineered installation system
- Faster and simpler installation process
- Consistent detailing and weather performance