Fixed roof skylight systems — single and double glazed

The Velux GGL CK02 is a centre-pivot roof window in the CK02 size (55×78cm), featuring a factory-lacquered pine frame with a timber-lined internal reveal suitable for direct paint or stain finish. The IGU unit consists of laminated inner glass and a tempered outer pane, argon-filled and low-e coated to comply with NCC Section J energy requirements for Class 2 buildings. The centre-pivot mechanism allows the sash to rotate 180° for cleaning from inside the room — a practical advantage in multi-storey strata buildings where external window cleaning requires specialised access. Pitch range is 15–90°, making this unit suitable for the full range of conventional tiled and metal roof pitches found in Australian residential construction. The 10-year Velux guarantee covers the complete unit including the IGU seal. Installation requires the matching Velux EDZ or BDX flashing kit for the roof type — confirm flashing kit selection with the Velux product selector before ordering. Velux GGL is the standard pitched-roof window in Australian strata remediation and is widely stocked by roofing and window suppliers nationally.

The Fakro FTP-V U3 is a fixed non-opening roof skylight with a PVC-coated pine frame, providing enhanced moisture resistance compared to uncoated or lacquered timber alternatives. The U3 designation refers to the triple-glass IGU with argon fill, achieving a frame U-value of Uf=1.2 W/m²K — a high-performing thermal specification suitable for Class 2 buildings in NCC climate zones requiring NCC Section J compliance. Available in a comprehensive range from 55×78cm to 94×140cm, providing flexibility for standard and oversized skylight replacement projects. AS 4285 compliance confirms the unit meets Australian standards for roof windows and skylights for thermal performance and weathertightness. The FTP-V includes Fakro's universal flashing collar, which is compatible with a range of tile profiles including terracotta, concrete, and Decramastic tiles — confirm flashing compatibility with the Fakro LFT or LFT insulated flashing kit selection for the specific roof type. The fixed non-opening design simplifies the frame construction and eliminates the moving sash seal — a common source of long-term air leakage and heat loss in operable roof windows. Recommended for habitable rooms where daylighting is the primary requirement and ventilation is provided by other means.

The Velux FCM Fixed Curb-Mount Skylight is Velux's flat and low-pitched roof skylight solution, designed for installation on a pre-built timber or structural curb at a minimum pitch of 2°. The unit features an aluminium frame — not timber — making it the appropriate specification for flat roof and membrane roof applications where timber frames would be exposed to ponding or moisture. The laminated low-e glass unit provides thermal performance compliant with NCC Section J for Class 2 buildings in relevant climate zones. IP4X rating confirms dust and splash protection suitable for exposed flat roof installations. The curb-mount design is compatible with all standard single-ply membrane roofing systems including TPO, FPO, and PVC membranes, as well as torch-on bitumen and HDPE sheet membranes — the membrane terminates to and over the curb perimeter, not to the skylight frame directly. This is a fundamentally different installation methodology to pitched roof skylights, and the waterproofing detail at the curb base must be designed and executed by a licensed waterproofer. The FCM is the correct Velux product for flat roof strata building applications — the GGL pitched roof window is not appropriate for flat or near-flat roof installations. Confirm curb height, curb construction specification, and membrane termination detail with the waterproofing contractor before ordering.