How and where to use guide
VELUX Standard Flashings 78x140cm EDL MK08 0000
Suitable applications and roof types
This flashing is designed for pitched roof installations where a 78x140cm VELUX roof window is being fitted. It works with standard tile, slate, and sheet roof coverings. The flashing system is engineered to work specifically with VELUX window frame systems, so it must be paired with the correct window size and frame type. It is not suitable for flat roof applications or non-standard window sizes.
- Pitched roofs with tile, slate, or sheet coverings
- 78x140cm VELUX roof window installations only
- New window installations or window replacements
- Roofs requiring weathertight sealing around window perimeter
Installation and alignment
Correct installation is critical to ensure the flashing performs its weathertight function. The flashing must be carefully aligned with the VELUX window frame and integrated with the roof structure so that water is directed away from the window perimeter and into the roof covering. The flashing sits between the window frame and the roof material, creating a seal that prevents water from entering around the edges of the window. Installation should follow VELUX guidance to ensure proper positioning and secure fixing to both the window frame and roof structure.
- Align flashing carefully with window frame before fixing
- Ensure flashing integrates properly with existing roof covering
- Direct water flow away from window perimeter into roof material below
- Secure flashing to both window frame and roof structure as per manufacturer instructions
- Check alignment and seal integrity before completing roof work
Maintenance and long-term performance
Once installed, the flashing requires minimal maintenance but should be inspected periodically to ensure the weathertight seal remains intact. Check that the flashing has not shifted or become damaged, and that water is flowing correctly away from the window. Debris such as moss, leaves, or dirt should be cleared from around the flashing to maintain proper water drainage. Any damage to the flashing or deterioration of the seal should be addressed promptly to prevent water ingress.
- Inspect flashing annually for damage or movement
- Clear debris from around flashing to maintain water drainage
- Check that weathertight seal remains intact
- Address any damage or deterioration immediately to prevent water ingress
Important limitations and on-site tips
This flashing is sized specifically for 78x140cm VELUX windows and will not fit other window sizes. It is designed for pitched roofs only and is not suitable for flat roof applications. Ensure you have the correct window size and frame type before ordering. The flashing must be installed as part of the complete VELUX window system to function correctly. Poor installation or misalignment can compromise the weathertight seal and lead to water damage, so careful workmanship is essential. Always follow VELUX installation guidance and ensure the roof structure is prepared correctly before fitting the flashing.
- Confirm window size is exactly 78x140cm before installation
- Not suitable for flat roofs or non-standard window sizes
- Must be used with compatible VELUX window frame systems
- Poor installation can compromise weathertight performance
- Follow VELUX installation guidance carefully for best results