VELUX Dual Action Roof Window (GPL)
The VELUX Dual Action Roof Window (GPL) is a premium daylight and ventilation solution designed for attic conversions, loft‑style rooms, and upper‑storey spaces where both outward views and natural airflow are essential. Its unique dual‑action design allows the sash to operate in two modes: a top‑hung opening that provides a clear, unobstructed view to the outside, and a centre‑pivot opening that enables controlled, secure ventilation.
The top‑hung mode opens outward to create a balcony‑like experience, enhancing the sense of space and connection to the outdoors. This makes the GPL particularly suited to bedrooms, studios, and living areas where expansive views and increased headroom are desirable. The centre‑pivot mode provides flexible ventilation and easy cleaning access, making the window practical for everyday use. High‑performance glazing delivers excellent thermal insulation, solar heat control, and UV protection, helping maintain comfortable indoor temperatures throughout the year. The laminated inner pane enhances safety, while the toughened outer pane provides durability and resistance to harsh weather conditions. The timber frame, protected by exterior aluminium cladding, ensures long‑lasting performance with minimal maintenance.
Architects value the GPL for its versatility, aesthetic appeal, and ability to transform under‑utilised roof spaces into bright, functional rooms. The integrated ventilation flap allows fresh air to enter even when the window is closed, supporting passive ventilation strategies and improving indoor air quality. With its combination of daylight, airflow, and panoramic views, the GPL is an ideal choice for projects seeking to elevate the quality and usability of upper‑storey spaces.
• Roof Pitch: 15°–55° (up to 75° with special installation considerations)
• Operation: Dual‑action — top‑hung + centre‑pivot
• Glazing: Laminated inner pane; toughened outer pane
• Frame Material: Timber core with protective aluminium cladding
• Sizes Available: Multiple standard sizes
• Installation: Suitable for tile or custom orb metal roofing with the appropriate VELUX flashing kit
• Ventilation: Integrated ventilation flap for passive airflow
