How and where to use guide
VELUX Standard Flashings 94x140cm EDW PK08 0000
Suitable applications and locations
This 94 x 140cm flashing is designed for medium-sized roof window openings in pitched roof construction. It is suitable for use in domestic properties such as loft conversions, extensions and new-build houses, as well as commercial buildings where roof windows are required. The flashing works effectively on timber-framed roofs, masonry construction with brickwork, and concrete roof structures. Install the flashing around VELUX roof windows and similar proprietary window systems to create a secure seal at the interface between the window frame and the roof covering.
- Domestic loft conversions and attic rooms
- Commercial building roof windows and skylights
- New-build and renovation projects
- Timber-framed, brick and concrete roof construction
Installation and positioning
Position the flashing around the roof window opening before installing the window frame or after removing an existing window. The flashing must sit flush against the substrate to prevent gaps where water can penetrate. On timber frames, secure the flashing with appropriate fixings to the roof structure. On brickwork and concrete, use suitable masonry fixings or adhesive bedding as recommended by the window manufacturer. Ensure the flashing overlaps the roof covering material below the window opening so that water runs down and away from the window frame. The natural timber finish requires careful handling during installation to avoid damage that could compromise the weather seal.
- Install before or during window frame installation
- Ensure full contact with substrate to prevent water ingress
- Overlap roof covering material below the window
- Use appropriate fixings for timber, brick or concrete substrates
- Avoid damaging the timber finish during handling and installation
Maintenance and durability
The timber-grade material with natural finish provides good durability and weather resistance when correctly installed and maintained. Inspect the flashing annually, particularly after severe weather, to check for any gaps, cracks or separation from the window frame or roof covering. Clear any debris, moss or lichen growth from the flashing surface to maintain water run-off. If the natural timber finish becomes damaged or worn, apply an appropriate timber sealant or treatment to restore weather protection. Ensure gutters and roof drainage around the window remain clear so water does not pool against the flashing.
- Inspect annually for gaps, cracks or separation
- Clear debris and organic growth to maintain water run-off
- Apply timber sealant if the natural finish becomes damaged
- Keep roof gutters and drainage clear around the window
Limitations and important notes
This flashing is sized for medium roof window openings at 94 x 140cm. Verify that your window opening matches this size before ordering. The flashing is designed for pitched roof installation and is not suitable for flat roofs or vertical wall applications. Correct installation is essential for weather-tight performance; poor fitting or gaps will allow water ingress and may lead to structural damage or mould growth. Always follow the window manufacturer's installation instructions alongside this guidance. The natural timber finish requires protection from extreme weather exposure and may require periodic maintenance to maintain long-term durability.
- Verify window opening size matches 94 x 140cm specification
- Pitched roof installation only; not suitable for flat roofs
- Correct installation is critical for weather-tight performance
- Follow window manufacturer's installation instructions