How and where to use guide
VELUX Standard Flashings 55x78cm EDL CK02 0000
Typical applications and suitability
This flashing is specifically designed for 55x78cm VELUX roof windows installed on pitched roofs. It is suitable for new build projects where roof windows are being integrated into the roof structure, and for retrofit installations where existing roof windows require replacement or repair. The flashing works with standard pitched roof constructions and is compatible with common roof coverings including tiles, slates, and sheet materials. Always verify that your roof window dimensions match 55x78cm before ordering, as flashings are size-specific.
- New build roof window installations on pitched roofs
- Retrofit and replacement projects for existing 55x78cm windows
- Pitched roof applications with tiles, slates, or sheet coverings
- Not suitable for flat roofs or non-standard window sizes
Installation and on-site guidance
Installation must follow VELUX guidance documentation to ensure a weathertight seal and proper performance. The flashing kit is complete, containing all necessary components for securing the window frame to the roof structure and creating the weather seal. Before installation, ensure the roof opening is correctly sized and prepared, and that the roof structure is sound and level. The flashing should be positioned to overlap roof covering materials appropriately, directing water away from the window frame and down the roof slope. Proper sealing of all joints and edges is critical to prevent water ingress.
- Follow VELUX installation guidance throughout the process
- Prepare the roof opening to correct dimensions and ensure structural soundness
- Position flashing to overlap roof covering materials correctly
- Seal all joints and edges thoroughly to create weathertight barrier
- Ensure proper water drainage away from the window frame
Material properties and maintenance
The aluminium construction provides excellent durability and natural corrosion resistance, requiring minimal maintenance once installed. Aluminium does not rust and maintains its integrity in exposed weather conditions over many years. Periodically inspect the flashing and surrounding roof area to ensure seals remain intact and that debris or moss does not accumulate around the window frame, which could trap moisture. Clean gutters and roof surfaces regularly to maintain proper water drainage.
- Aluminium construction resists corrosion and requires no protective coating
- Inspect flashing annually for seal integrity and damage
- Clear debris and moss from around the window frame and roof area
- Maintain clear water drainage paths on the roof slope
Limitations and important considerations
This flashing is designed specifically for 55x78cm VELUX roof windows and will not fit other window sizes. It is intended for pitched roof applications only and is not suitable for flat roofs or other roof types. The flashing creates a weathertight seal only when installed correctly according to VELUX guidance; improper installation may result in water leaks and damage to the roof structure. Installation should be carried out by competent builders or installers familiar with roof window installation procedures.
- Size-specific: only fits 55x78cm VELUX roof windows
- Pitched roof applications only; not for flat roofs
- Correct installation is essential for weathertight performance
- Requires competent installer with roof window experience